Merge pull request #17416 from gasolin/issue-985341

Bug 985341 - Fix uitest-privileged for test_video_capture_prompt failure
Bug 985341 - Repair manifest file change from bug 985341 a=testonly r=me
Bug 1000062 - Delete some more redundant tests
Bug 1000062 - Delete some more redundant tests
Merge pull request #18237 from jankeromnes/updatechannel

Bug 984962 - Expose app.update.{channel,url} in the Developer menu. r=21
Revert "Revert "Bug 924833 - Re-enable test_receive_call.py" for requiring plivo, which isn't on the mirror"

This reverts commit 381009095bc7d2b9aea26a641f5e8df7c8728efc.
Bug 996645 - Data Connection switch is not waiting for the Connection to be "active" before switching to the the on state
Merge pull request #18579 from bebef1987/cell_data

Bug 996645 - Data Connection switch is not waiting for the Connection to...
Bug 1000859 - Add Xhosa xh locale
Merge pull request #18592 from bebef1987/ev_me

Bug 1000062 - Delete some more redundant tests
Bug 998914 - [Settings] Cannot preselect the APN correctly if there are several APNs with the same carrier name (follow-up bug 991628)
Merge pull request #18632 from crdlc/bug-991114

Bug 991114 - [Contacts] Invalid text when user delete multiple contacts
Merge pull request #16983 from flodolo/bug931119_smslabels

Bug 931119 - [SMS] Localize labels in thread header, don't hardcode separator characters
Merge pull request #17506 from azasypkin/bug_936729

Bug 936729 - [Messages][Sharing]MMS does not return to original app after cancelling or sending message
Merge pull request #18504 from guilherme-pg/bug997309

Bug 997309 - Don't unset 'findmydevice.enabled' in the settings when already logged in
Merge pull request #18371 from benfrancis/993346

Bug 993346 Show/hide Rocketbar by scrolling r=alive r=daleharvey
Merge pull request #18577 from etiennesegonzac/bug-999478-on-demand-callscreen

Bug 999478 - Free the preloaded callscreen under memory pressure
Merge pull request #18567 from Archaeopteryx/settings-a11y-l10n-bug999946

Bug 999946 - Some Accessibility settings are not localized. r=evelyn
Bug 991141 - [Follow up from Bug 956219] Look and feel for "Delete contacts" button under Settings
Merge pull request #18445 from chuck-lee/bug-997791_Gaia_ui_test_error_on_wifi_enable_disable

Bug 997791 - Simulate echo setting to "wifi.enabled" from system app. r=arthurcc