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diff --git a/l10n-cy/mail/messenger/menubar.ftl b/l10n-cy/mail/messenger/menubar.ftl
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+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+toolbar-context-menu-menu-bar =
+    .toolbarname = Bar Dewislen
+    .accesskey = D
+
+## Tools Menu
+
+menu-tools-settings =
+    .label = Gosodiadau
+    .accesskey = G
+
+menu-addons-and-themes =
+    .label = Ychwanegion a Themâu
+    .accesskey = Y
+
+## Help Menu
+
+menu-help-help-title =
+    .label = Cymorth
+    .accesskey = C
+
+menu-help-get-help =
+    .label = Derbyn Cymorth
+    .accesskey = D
+
+menu-help-explore-features =
+    .label = Edrych ar y Nodweddion
+    .accesskey = E
+
+menu-help-shortcuts =
+    .label = Llwybrau Byr Bysellfwrdd
+    .accesskey = L
+
+menu-help-get-involved =
+    .label = Ymunwch
+    .accesskey = Y
+
+menu-help-donation =
+    .label = Gwnewch Rodd
+    .accesskey = G
+
+menu-help-share-feedback =
+    .label = Rhannwch Syniadau ac Adborth…
+    .accesskey = R
+
+menu-help-enter-troubleshoot-mode =
+    .label = Y Modd Datrys Problemau…
+    .accesskey = M
+
+menu-help-exit-troubleshoot-mode =
+    .label = Diffodd y Modd Dartrys Problemau
+    .accesskey = D
+
+menu-help-more-troubleshooting-info =
+    .label = Rhagor o Wybodaeth Datrys Problemau
+    .accesskey = R
+
+menu-help-troubleshooting-info =
+    .label = Gwybodaeth am Ddatrys Problemau
+    .accesskey = G
+
+menu-help-about-product =
+    .label = Ynghylch { -brand-short-name }
+    .accesskey = Y
+
+# These menu-quit strings are only used on Windows and Linux.
+menu-quit =
+    .label =
+        { PLATFORM() ->
+            [windows] Gadael
+           *[other] Gadael
+        }
+    .accesskey =
+        { PLATFORM() ->
+            [windows] G
+           *[other] G
+        }
+
+# This menu-quit-mac string is only used on macOS.
+menu-quit-mac =
+    .label = Gadael { -brand-shorter-name }
+
+quit-app-shortcut =
+    .key = G
+
+## Mail Toolbar
+
+toolbar-junk-button =
+    .label = Sbwriel
+    .tooltiptext = Marcio'r negeseuon hyn fel sbwriel
+toolbar-not-junk-button =
+    .label = Nid Sbwriel
+    .tooltiptext = Marcio'r negeseuon hyn fel nid sbwriel
+toolbar-delete-button =
+    .label = Dileu
+    .tooltiptext = Dileu'r negeseuon neu ffolderi hyn
+toolbar-undelete-button =
+    .label = Dad-ddileu
+    .tooltiptext = Dad-ddileu'r negeseuon hyn
+
+## View
+
+menu-view-repair-text-encoding =
+    .label = Trwsio Amgodio Testun
+    .accesskey = T
+
+## View / Layout
+
+menu-font-size-label =
+    .label = Maint Ffont
+    .accesskey = M
+
+menuitem-font-size-enlarge =
+    .label = Cynyddu Maint Ffont
+    .accesskey = F
+
+menuitem-font-size-reduce =
+    .label = Lleihau Maint Ffont
+    .accesskey = L
+
+menuitem-font-size-reset =
+    .label = Ailosod Maint Ffont
+    .accesskey = A
+
+mail-uidensity-label =
+    .label = Dwysedd
+    .accesskey = D
+
+mail-uidensity-compact =
+    .label = Cryno
+    .accesskey = C
+
+mail-uidensity-normal =
+    .label = Arferol
+    .accesskey = A
+
+mail-uidensity-touch =
+    .label = Cyffwrdd
+    .accesskey = y
+
+mail-uidensity-default =
+    .label = Rhagosodiad
+    .accesskey = R
+
+mail-uidensity-relaxed =
+    .label = Llaes
+    .accesskey = L
+
+menu-spaces-toolbar-button =
+    .label = Bar Offer Mannau
+    .accesskey = B
+
+## File
+
+file-new-newsgroup-account =
+    .label = Cyfrif Grŵp Newyddion…
+    .accesskey = N