Merge pull request #19899 from mschwart/bug991949

Bug 991949 - Cell broadcast ETWS messages show undefined, r=timdream
Merge pull request #20502 from yzen/bug-1024720

Bug 1024720 - making accessibility settings' volume and rate sliders vis...
Merge pull request #20764 from KevinGrandon/benfrancis-1026293

Bug 1026293 - Remove e.me as an available search engine and set new default in build
Merge pull request #20636 from russnicoletti/bug-1013464

Bug 1013464 -- intermittent dom.player is null during video_test.js unit testing r=johu
Bug 1024887 - Move language related code to a separate module
 Bug 1024695 - Intermittent keyboard_settings_test.js |
 manipulate keyboard settings Launch built-in keyboard's settings page
  - Add waiting logic in switchToApp function when switching to keyboard
    app settings page.
Merge pull request #20740 from crdlc/bug-1026153

Bug 1026153 - [Vertical homescreen] Icon gets stuck while dragging and p...
Merge pull request #20737 from crdlc/bug-1027547

Bug 1027547 - [Vertical Homescreen] [Smart collections] Context menu is ...
Merge pull request #20749 from crdlc/bug-1026716

Bug 1026716 - Selecting a search suggestion should update the search fie...
Merge pull request #20483 from crh0716/1024887

Bug 1024887 - Move language related code to a separate module r=eragon
Bug 1027480 - new l10n id for contact's custom tag
Bug 1025963 - [Collection app] Pinned apps edit mode r=crdlc
Bug 1024168 - Dispatch inner window event on its element
Merge pull request #20674 from nullaus/bug1021857

bug 1021857 - Ensure z-index for AttentionScreen makes it top-most.
Bug 1015833 - [PTCRB][STK]27.22.4.1.1/2 DISPLAY TEXT, normal priority, Unpacked 8 bit data for Text String, screen busy case failed, r=vingtetun
Revert "Bug 1019362 - adding a number of gaia ui tests for the first time use app accessibility." for intermittent failures in test_a11y_ftu_desktopb2g.py

This reverts commit b32106f02bebda6546983c2b4b57a78e020abc90.
Bug 1026377 - [Sora]There is no highlight stripe when selecting some option in STK menu
Bug 1026387 - [Dialer][Call log] 'missed' highlighted when tapping edit and back, then tapping 'all'
Merge pull request #20733 from pacorampas/missing-headset-oncall-1018495

Bug 1018495 - [Flame][Dialer] Missing headset icon when calling r=rik
Bug 1023044 - Show the signal bar for a locked sim only when making emergency calls using the sim.