Merging upstream version 1.12.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

7 files changed, 234 insertions, 114 deletions

diff --git a/docs/Add-more-charts-to-netdata.md b/docs/Add-more-charts-to-netdata.md
index 95efd70b..d8a04c85 100644
--- a/docs/Add-more-charts-to-netdata.md
+++ b/docs/Add-more-charts-to-netdata.md
@@ -22,7 +22,7 @@ To collect non-system metrics, netdata supports a plugin architecture. The follo
 - **[Print Servers](#print-servers)**, like CUPS
 - **[System](#system)**, for processes and other system metrics
 - **[Sensors](#sensors)**, like temperature, fans speed, voltage, humidity, HDD/SSD S.M.A.R.T attributes
-- **[Network](#network)**, such as SNMP devices, `fping`, access points, dns_query_time
+- **[Network](#network)**, such as SNMP devices, `fping`, access points, dns_query_time, nfacct
 - **[Time Servers](#time-servers)**, like chrony
 - **[Security](#security)**, like FreeRADIUS, OpenVPN, Fail2ban
 - **[Telephony Servers](#telephony-servers)**, like openSIPS
@@ -43,7 +43,7 @@ netdata comes with **internal** and **external** plugins:
 1. The **internal** ones are written in `C` and run as threads within the netdata daemon.
 2. The **external** ones can be written in any computer language. The netdata daemon spawns these as processes (shown with `ps fax`) and reads their metrics using pipes (so the `stdout` of external plugins is connected to netdata for metrics collection and the `stderr` of external plugins is connected to `/var/log/netdata/error.log`).
 
-To make it easier to develop plugins, and minimize the number of threads and processes running, netdata supports **plugin orchestrators**, each of them supporting one or more data collection **modules**. Currently we ship plugin orchestrators for 4 languages: `C`, `python`, `node.js` and `bash` and 2 more are under development (`go` and `java`). 
+To make it easier to develop plugins, and minimize the number of threads and processes running, netdata supports **plugin orchestrators**, each of them supporting one or more data collection **modules**. Currently we ship plugin orchestrators for 4 languages: `C`, `python`, `node.js` and `bash` and 2 more are under development (`go` and `java`).
 
 #### enabling and disabling plugins
 
@@ -338,6 +338,7 @@ application|language|notes|
 ap|BASH<br/>Shell Script|Uses the `iw` command to provide statistics of wireless clients connected to a wireless access point running on this host (works well with `hostapd`).<br/>&nbsp;<br/>netdata plugin: [charts.d.plugin](../collectors/charts.d.plugin#chartsdplugin)<br/>plugin module: [ap.chart.sh](../collectors/charts.d.plugin/ap)<br/>configuration file: [charts.d/ap.conf](../collectors/charts.d.plugin/ap)|
 fping|C|Charts network latency statistics for any number of nodes, using the `fping` command. A recent (probably unreleased) version of fping is required. The plugin supplied can install it in `/usr/local`.<br/>&nbsp;<br/>netdata plugin: [fping.plugin](../collectors/fping.plugin) (this is a shell wrapper to start fping - once fping is started, netdata and fping communicate directly - it can also install the right version of fping)<br/>configuration file: [fping.conf](../collectors/fping.plugin)|
 snmp|node.js|Connects to multiple snmp servers to collect real-time performance metrics.<br/>&nbsp;<br/>netdata plugin: [node.d.plugin](../collectors/node.d.plugin#nodedplugin)<br/>plugin module: [snmp.node.js](../collectors/node.d.plugin/snmp)<br/>configuration file: [node.d/snmp.conf](../collectors/node.d.plugin/snmp)|
+nfacct|C|collects netfilter firewall, connection tracker and accounting metrics using `libmnl` and `libnetfilter_acct`|
 dns_query_time|python<br/>v2 or v3|Provides DNS query time statistics.<br/>&nbsp;<br/>Requires package `dnspython` (`pip install dnspython` or install package `python-dnspython`).<br/>&nbsp;<br/>netdata plugin: [python.d.plugin](../collectors/python.d.plugin)<br/>plugin module: [dns_query_time.chart.py](../collectors/python.d.plugin/dns_query_time)<br/>configuration file: [python.d/dns_query_time.conf](../collectors/python.d.plugin/dns_query_time)|
 http|python<br />v2 or v3|Monitors a generic web page for status code and returned content in HTML
 port|ptyhon<br />v2 or v3|Checks if a generic TCP port for its availability and response time
diff --git a/docs/generator/buildhtml.sh b/docs/generator/buildhtml.sh
index 3cc87d29..04311224 100755
--- a/docs/generator/buildhtml.sh
+++ b/docs/generator/buildhtml.sh
@@ -13,21 +13,27 @@ if [ "$currentdir" = "generator" ]; then
 	cd ../..
 fi
 GENERATOR_DIR="docs/generator"
+SRC_DIR="${GENERATOR_DIR}/src"
+# Fetch go.d.plugin docs
+GO_D_DIR="collectors/go.d.plugin"
+rm -rf ${GO_D_DIR}
+git clone https://github.com/netdata/go.d.plugin.git ${GO_D_DIR}
 
 # Copy all netdata .md files to docs/generator/src. Exclude htmldoc itself and also the directory node_modules generatord by Netlify
 echo "Copying files"
-rm -rf ${GENERATOR_DIR}/src
-find . -type d \( -path ./${GENERATOR_DIR} -o -path ./node_modules \) -prune -o -name "*.md" -print | cpio -pd ${GENERATOR_DIR}/src
+rm -rf ${SRC_DIR}
+find . -type d \( -path ./${GENERATOR_DIR} -o -path ./node_modules \) -prune -o -name "*.md" -print | cpio -pd ${SRC_DIR}
 
 # Copy netdata html resources
-cp -a ./${GENERATOR_DIR}/custom ./${GENERATOR_DIR}/src/
+cp -a ./${GENERATOR_DIR}/custom ./${SRC_DIR}/
+
 
 # Modify the first line of the main README.md, to enable proper static html generation
 echo "Modifying README header"
-sed -i -e '0,/# netdata /s//# Introduction\n\n/' ${GENERATOR_DIR}/src/README.md
+sed -i -e '0,/# netdata /s//# Introduction\n\n/' ${SRC_DIR}/README.md
 
 # Remove all GA tracking code
-find ${GENERATOR_DIR}/src -name "*.md" -print0 | xargs -0 sed -i -e 's/\[!\[analytics.*UA-64295674-3)\]()//g'
+find ${SRC_DIR} -name "*.md" -print0 | xargs -0 sed -i -e 's/\[!\[analytics.*UA-64295674-3)\]()//g'
 
 # Remove specific files that don't belong in the documentation
 declare -a EXCLUDE_LIST=(
@@ -37,24 +43,62 @@ declare -a EXCLUDE_LIST=(
 )
 
 for f in "${EXCLUDE_LIST[@]}"; do
-	rm "${GENERATOR_DIR}/src/$f"
+	rm "${SRC_DIR}/$f"
 done
 
-echo "Creating mkdocs.yaml"
+echo "Fetching localization project"
+LOC_DIR=${GENERATOR_DIR}/localization
+rm -rf ${LOC_DIR}
+git clone https://github.com/netdata/localization.git ${LOC_DIR}
+
+echo "Preparing directories"
+MKDOCS_CONFIG_FILE="${GENERATOR_DIR}/mkdocs.yml"
+MKDOCS_DIR="doc"
+DOCS_DIR=${GENERATOR_DIR}/${MKDOCS_DIR}
+rm -rf ${DOCS_DIR}
+mkdir ${DOCS_DIR}
+
+prep_html() {
+	lang="${1}"
+	echo "Creating ${lang} mkdocs.yaml"
+
+	if [ "${lang}" = "en" ] ; then
+		SITE_DIR="build"
+	else
+		SITE_DIR="build/${lang}"
+	fi
 
-# Generate mkdocs.yaml
-${GENERATOR_DIR}/buildyaml.sh >${GENERATOR_DIR}/mkdocs.yml
+	# Generate mkdocs.yaml
+	${GENERATOR_DIR}/buildyaml.sh ${MKDOCS_DIR} ${SITE_DIR} ${lang}>${MKDOCS_CONFIG_FILE}
 
-echo "Fixing links"
+	echo "Fixing links"
 
-# Fix links (recursively, all types, executing replacements)
-${GENERATOR_DIR}/checklinks.sh -rax
+	# Fix links (recursively, all types, executing replacements)
+	${GENERATOR_DIR}/checklinks.sh -rax
 
-if [ "${1}" != "nomkdocs" ] ; then
 	echo "Calling mkdocs"
 
 	# Build html docs
-	mkdocs build --config-file=${GENERATOR_DIR}/mkdocs.yml
-fi
+	mkdocs build --config-file="${MKDOCS_CONFIG_FILE}"
+
+	# Fix edit buttons for the markdowns that are not on the main netdata repo
+	find "${GENERATOR_DIR}/${SITE_DIR}/${GO_D_DIR}" -name "*.html" -print0 | xargs -0 sed -i -e 's/https:\/\/github.com\/netdata\/netdata\/blob\/master\/collectors\/go.d.plugin/https:\/\/github.com\/netdata\/go.d.plugin\/blob\/master/g'
+	if [ "${lang}" != "en" ] ; then
+		find "${GENERATOR_DIR}/${SITE_DIR}" -name "*.html" -print0 | xargs -0 sed -i -e 's/https:\/\/github.com\/netdata\/netdata\/blob\/master\/\S*md/https:\/\/github.com\/netdata\/localization\//g'
+	fi
+}
+
+for d in "en" $(find ${LOC_DIR} -mindepth 1 -maxdepth 1 -name .git -prune -o -type d -printf '%f ') ; do
+	echo "Preparing source for $d"
+	cp -a ${SRC_DIR}/* ${DOCS_DIR}/
+	if [ "${d}" != "en" ] ; then
+		cp -a ${LOC_DIR}/${d}/* ${DOCS_DIR}/
+	fi
+	prep_html $d
+	rm -rf ${DOCS_DIR}/*
+done
+
+# Remove cloned projects and temp directories
+rm -rf ${GO_D_DIR} ${LOC_DIR} ${DOCS_DIR} ${SRC_DIR}
 
 echo "Finished"
diff --git a/docs/generator/buildyaml.sh b/docs/generator/buildyaml.sh
index a86b1392..553f60c8 100755
--- a/docs/generator/buildyaml.sh
+++ b/docs/generator/buildyaml.sh
@@ -1,7 +1,12 @@
 #!/bin/bash
 
 GENERATOR_DIR="docs/generator"
-cd ${GENERATOR_DIR}/src
+
+docs_dir="${1}"
+site_dir="${2}"
+language="${3}"
+
+cd ${GENERATOR_DIR}/${docs_dir}
 
 # create yaml nav subtree with all the files directly under a specific directory
 # arguments:
@@ -48,8 +53,8 @@ repo_name: GitHub
 edit_uri: blob/master
 site_description: Netdata Documentation
 copyright: Netdata, 2018
-docs_dir: src
-site_dir: build
+docs_dir: '${docs_dir}'
+site_dir: '${site_dir}'
 #use_directory_urls: false
 strict: true
 extra:
@@ -64,6 +69,7 @@ theme:
     name: "material"
     custom_dir: custom/themes/material
     favicon: custom/img/favicon.ico
+    language: '${language}'
 extra_css:
   - "https://cdnjs.cloudflare.com/ajax/libs/cookieconsent2/3.1.0/cookieconsent.min.css"
   - "custom/css/netdata.css"
@@ -167,43 +173,58 @@ navpart 3 collectors/statsd.plugin
 navpart 3 collectors/cgroups.plugin
 navpart 3 collectors/idlejitter.plugin
 navpart 3 collectors/tc.plugin
-navpart 3 collectors/nfacct.plugin
 navpart 3 collectors/checks.plugin
 navpart 3 collectors/diskspace.plugin
 navpart 3 collectors/freebsd.plugin
 navpart 3 collectors/macos.plugin
 
 navpart 2 collectors/plugins.d "" "External plugins"
-navpart 3 collectors/python.d.plugin "" "Python modules" 3
-navpart 3 collectors/node.d.plugin "" "Node.js modules" 3
-echo -ne "        - BASH modules:
+
+echo -ne "        - Go:
+            - 'collectors/go.d.plugin/README.md'
+"
+navpart 4 collectors/go.d.plugin "" "Modules" 3 excludefirstlevel
+
+echo -ne "        - Python:
+            - 'collectors/python.d.plugin/README.md'
+"
+navpart 4 collectors/python.d.plugin "" "Modules" 3 excludefirstlevel
+
+echo -ne "        - Node.js:
+            - 'collectors/node.d.plugin/README.md'
+"
+navpart 4 collectors/node.d.plugin "" "Modules" 3 excludefirstlevel
+
+echo -ne "        - BASH:
             - 'collectors/charts.d.plugin/README.md'
-            - 'collectors/charts.d.plugin/ap/README.md'
-            - 'collectors/charts.d.plugin/apcupsd/README.md'
-            - 'collectors/charts.d.plugin/example/README.md'
-            - 'collectors/charts.d.plugin/libreswan/README.md'
-            - 'collectors/charts.d.plugin/nut/README.md'
-            - 'collectors/charts.d.plugin/opensips/README.md'
-        - Obsolete BASH modules:
-            - 'collectors/charts.d.plugin/mem_apps/README.md'
-            - 'collectors/charts.d.plugin/postfix/README.md'
-            - 'collectors/charts.d.plugin/tomcat/README.md'
-            - 'collectors/charts.d.plugin/sensors/README.md'
-            - 'collectors/charts.d.plugin/cpu_apps/README.md'
-            - 'collectors/charts.d.plugin/squid/README.md'
-            - 'collectors/charts.d.plugin/nginx/README.md'
-            - 'collectors/charts.d.plugin/hddtemp/README.md'
-            - 'collectors/charts.d.plugin/cpufreq/README.md'
-            - 'collectors/charts.d.plugin/mysql/README.md'
-            - 'collectors/charts.d.plugin/exim/README.md'
-            - 'collectors/charts.d.plugin/apache/README.md'
-            - 'collectors/charts.d.plugin/load_average/README.md'
-            - 'collectors/charts.d.plugin/phpfpm/README.md'
+            - Modules:
+                - 'collectors/charts.d.plugin/ap/README.md'
+                - 'collectors/charts.d.plugin/apcupsd/README.md'
+                - 'collectors/charts.d.plugin/example/README.md'
+                - 'collectors/charts.d.plugin/libreswan/README.md'
+                - 'collectors/charts.d.plugin/nut/README.md'
+                - 'collectors/charts.d.plugin/opensips/README.md'
+            - Obsolete Modules:
+                - 'collectors/charts.d.plugin/mem_apps/README.md'
+                - 'collectors/charts.d.plugin/postfix/README.md'
+                - 'collectors/charts.d.plugin/tomcat/README.md'
+                - 'collectors/charts.d.plugin/sensors/README.md'
+                - 'collectors/charts.d.plugin/cpu_apps/README.md'
+                - 'collectors/charts.d.plugin/squid/README.md'
+                - 'collectors/charts.d.plugin/nginx/README.md'
+                - 'collectors/charts.d.plugin/hddtemp/README.md'
+                - 'collectors/charts.d.plugin/cpufreq/README.md'
+                - 'collectors/charts.d.plugin/mysql/README.md'
+                - 'collectors/charts.d.plugin/exim/README.md'
+                - 'collectors/charts.d.plugin/apache/README.md'
+                - 'collectors/charts.d.plugin/load_average/README.md'
+                - 'collectors/charts.d.plugin/phpfpm/README.md'
 "
 
 navpart 3 collectors/fping.plugin
 navpart 3 collectors/freeipmi.plugin
 navpart 3 collectors/cups.plugin
+navpart 3 collectors/nfacct.plugin
 
 echo -ne "    - 'docs/Third-Party-Plugins.md'
 "
diff --git a/docs/generator/checklinks.sh b/docs/generator/checklinks.sh
index d0c3b165..6538d39b 100755
--- a/docs/generator/checklinks.sh
+++ b/docs/generator/checklinks.sh
@@ -36,72 +36,6 @@ fix () {
 	fi
 }
 
-ck_netdata_absolute () {
-	f=$1
-	alnk=$2
-	lnkinfile=$3
-	testURL "$alnk"
-
-	if [[ $f =~ ^(.*)/([^/]*)$ ]] ; then
-		fpath="${BASH_REMATCH[1]}"
-		dbg "-- Current file is at $fpath"
-	fi
-
-	if [ $? -eq 0 ] ; then 
-		rlnk=$(echo "$alnk" | sed 's/https:\/\/github.com\/netdata\/netdata\/....\/master\///g')
-		case $rlnk in
-			\#* ) dbg "-- (#somelink)" ;;
-			*/ ) dbg "-- # (path/)" ;;
-			*/#* ) dbg "-- # (path/#somelink)" ;;
-			*/*.md ) dbg "-- # (path/filename.md)" ;;
-			*/*.md#* ) dbg "-- # (path/filename.md#somelink)" ;;
-			*#* ) 
-				dbg "-- # (path#somelink) -> (path/#somelink)" 
-				if [[ $rlnk =~ ^(.*)#(.*)$ ]] ; then
-					dbg "-- $rlnk -> ${BASH_REMATCH[1]}/#${BASH_REMATCH[2]}"
-					rlnk="${BASH_REMATCH[1]}/#${BASH_REMATCH[2]}"
-				fi
-				;;		
-			* )
-				if [ -f "$rlnk" ] ; then
-					dbg "-- # (path/someotherfile) $rlnk"
-				else
-					if [ -d "$rlnk" ] ; then
-						dbg "-- # (path) -> (path/)"
-						rlnk="$rlnk/"
-					else
-						echo "-- ERROR: $f - $alnk is neither a file nor a directory. Giving up!"
-						EXITCODE=1
-						return
-					fi
-				fi
-				;;
-		esac
-
-		if [[ $rlnk =~ ^(.*)/([^/]*)$ ]] ; then
-			abspath="${BASH_REMATCH[1]}"
-			rest="${BASH_REMATCH[2]}"
-			dbg "-- Target file is at $abspath"
-		fi
-		relativelink=$(realpath --relative-to="$fpath" "$abspath")
-		if [ $? -eq 0 ] ; then
-			srch=$(echo "$lnkinfile" | sed 's/\//\\\//g')
-			if [ "$relativelink" = "." ] ; then
-				rplc=$(echo "$rest" | sed 's/\//\\\//g')
-			else
-				rplc=$(echo "$relativelink/$rest" | sed 's/\//\\\//g')
-			fi
-			fix "sed -i 's/($srch)/($rplc)/g' $f"
-		else
-			echo "-- ERROR: $f - Can't determine relative path of $alnk" 
-		fi
-	else
-		echo "-- ERROR: $f - $alnk is a broken link"
-		EXITCODE=1
-		return
-	fi
-}
-
 testURL () {
 	if [ "$TESTURLS" -eq 0 ] ; then return 0 ; fi
 	dbg "-- Testing URL $1"
@@ -278,7 +212,7 @@ ck_netdata_relative () {
 		if [[ ! -z $s ]] ; then
 			srch=$(echo "$rlnk" | sed 's/\//\\\//g')
 			rplc=$(echo "$s" | sed 's/\//\\\//g')
-			fix "sed -i 's/($srch)/($rplc)/g' $GENERATOR_DIR/src/$f"
+			fix "sed -i 's/($srch)/($rplc)/g' $GENERATOR_DIR/doc/$f"
 		fi
 }
 
@@ -299,8 +233,8 @@ checklinks () {
 						if [ "$CHKWIKI" -eq 1 ] ; then echo "-- WARNING: $f - $lnk points to the wiki. Please replace it manually" ; fi
 					;;
 					https://github.com/netdata/netdata/????/master* )
-						dbg "-- Absolute link $lnk"
-						if [ "$CHKABSOLUTE" -eq 1 ] ; then ck_netdata_absolute "$f" "$lnk" "$lnk" ; fi
+						echo "-- ERROR: $f - $lnk is an absolute link to a netdata file. Please convert to relative."
+						EXITCODE=1
 					;;
 					http* ) 
 						dbg "-- External link $lnk"
diff --git a/docs/generator/custom/img/geography-16.png b/docs/generator/custom/img/geography-16.png
new file mode 100644
index 00000000..48391f95
--- /dev/null
+++ b/docs/generator/custom/img/geography-16.png
diff --git a/docs/generator/custom/themes/material/partials/footer.html b/docs/generator/custom/themes/material/partials/footer.html
index fe232b6d..0631a304 100644
--- a/docs/generator/custom/themes/material/partials/footer.html
+++ b/docs/generator/custom/themes/material/partials/footer.html
@@ -52,3 +52,16 @@
   </div>
 </footer>
 <script>!function(e,a,t,n,o,c,i){e.GoogleAnalyticsObject=o,e.ga=e.ga||function(){(e.ga.q=e.ga.q||[]).push(arguments)},e.ga.l=1*new Date,c=a.createElement(t),i=a.getElementsByTagName(t)[0],c.async=1,c.src="https://www.google-analytics.com/analytics.js",i.parentNode.insertBefore(c,i)}(window,document,"script",0,"ga"),ga("create","UA-64295674-3",""),ga("set","anonymizeIp",!0),ga("send","pageview","/doc"+window.location.pathname);var links=document.getElementsByTagName("a");if(Array.prototype.map.call(links,function(a){a.host!=document.location.host&&a.addEventListener("click",function(){var e=a.getAttribute("data-md-action")||"follow";ga("send","event","outbound",e,a.href)})}),document.forms.search){var query=document.forms.search.query;query.addEventListener("blur",function(){if(this.value){var e=document.location.pathname;ga("send","pageview",e+"?q="+this.value)}})}</script>
+<script>
+  let currentLang = getLanguage();
+
+  let sel = document.getElementById('sel');
+  let opts = sel.options;
+  for (let opt, j = 0; opt = opts[j]; j++) {
+    if (opt.value == currentLang) {
+      sel.selectedIndex = j;
+      break;
+    }
+  }
+
+</script>
diff --git a/docs/generator/custom/themes/material/partials/header.html b/docs/generator/custom/themes/material/partials/header.html
new file mode 100644
index 00000000..54086ecf
--- /dev/null
+++ b/docs/generator/custom/themes/material/partials/header.html
@@ -0,0 +1,107 @@
+<header class="md-header" data-md-component="header">
+  <nav class="md-header-nav md-grid">
+    <div class="md-flex">
+      <div class="md-flex__cell md-flex__cell--shrink">
+        <a href="{{ config.site_url | default(nav.homepage.url, true) | url }}" title="{{ config.site_name }}" class="md-header-nav__button md-logo">
+          {% if config.theme.logo.icon %}
+            <i class="md-icon">{{ config.theme.logo.icon }}</i>
+          {% else %}
+            <img src="{{ config.theme.logo | url }}" width="24" height="24">
+          {% endif %}
+        </a>
+      </div>
+      <div class="md-flex__cell md-flex__cell--shrink">
+        <label class="md-icon md-icon--menu md-header-nav__button" for="__drawer"></label>
+      </div>
+      <div class="md-flex__cell md-flex__cell--stretch">
+        <div class="md-flex__ellipsis md-header-nav__title" data-md-component="title">
+          {% block site_name %}
+            {% if config.site_name == page.title %}
+              {{ config.site_name }}
+            {% else %}
+              <span class="md-header-nav__topic">
+                {{ config.site_name }}
+              </span>
+              <span class="md-header-nav__topic">
+                {{ page.title }}
+              </span>
+            {% endif %}
+          {% endblock %}
+        </div>
+      </div>
+      <div class="md-flex__cell md-flex__cell--shrink">
+        {% block search_box %}
+          {% if "search" in config["plugins"] %}
+            <label class="md-icon md-icon--search md-header-nav__button" for="__search"></label>
+            {% include "partials/search.html" %}
+          {% endif %}
+        {% endblock %}
+      </div>
+
+      <!-- netdata -->
+      <style>
+        .language-selector li {
+          list-style: none;
+        }
+
+        .language-option.selected {
+          background-color: #ccc;
+        }
+      </style>
+      <script>
+        function getLanguage() {
+          const lang = window.location.pathname.split("/")[1];
+
+          if (lang.length == 0 || lang.length > 2) {
+            return "en";
+          }
+
+          return lang;
+        }
+
+        function languagePrefix(lang) {
+          if (lang === "en") {
+            return "";
+          }
+
+          return `/${lang}`;
+        }
+
+        function updatePathname(pathname, lang) {
+          if (currentLang !== "en") {
+            const parts = pathname.split("/");
+            parts.shift();
+            parts.shift();
+            pathname = `/${parts.join("/")}`;
+          }
+
+          return `${languagePrefix(lang)}${pathname}`;
+        }
+
+        function setLanguage(sel) {
+          if (sel.value === currentLang) {
+            return;
+          }
+
+          window.location.pathname = updatePathname(window.location.pathname, sel.value);
+        }
+      </script>
+
+      <div style="vertical-align: middle; white-space: nowrap; padding-left: 20px;" class="md-flex__cell md-flex__cell--shrink">
+        <img src="/custom/img/geography-16.png" style="vertical-align: middle;"/>
+        <select id="sel" onchange="setLanguage(this);" style="vertical-align: middle; background-color: #3f51b5; color: white; border: none;">
+          <option href="#" value='en'>English</option>
+          <option href="#" value='zh'>中文</option>
+        </select>
+      </div>
+
+      {% if config.repo_url %}
+        <div class="md-flex__cell md-flex__cell--shrink">
+          <div class="md-header-nav__source">
+            {% include "partials/source.html" %}
+          </div>
+        </div>
+      {% endif %}
+    </div>
+  </nav>
+</header>