Merge pull request #13560 from luke-chang/936986_pinyin_unit_test_failure

Bug 936986 - [Test][keyboard] Travis unit test failure on "jspinyin deactivate", r=rudylu
Bug 936418 - [keyboard] 'Layout selection' in keyboard style switcher dialog isn't localized
Merge pull request #13507 from MBRSL/bug-935835-tab

Bug - 935835 [HW test] [polish] highlight the selected tab, r=gasolin
Merge pull request #13558 from mpizza/Bug_936418_localized

Bug 936418 - [keyboard] 'Layout selection' in keyboard style switcher di... r=rudyl.
Bug 906549 - Set a background-size to handle images
Bug 926169 - add backward compatibility check for mobileConnection

- use latest Gecko API and fallback when needed
Merge pull request #13547 from lightsofapollo/fix-settings-locked

Bug 936310 - Fix bug where setting lockscreen.enabled = false in the pro... +shepherd
Bug 936373 - Optimize FB datastore index refresh by tracking revisionId number
Bug 936579 - Bring back Hungarian autocorrect
Merge pull request #13565 from RudyLu/keyboard/Bug905241_and_Bug925318-disabled_keyboard_tutorial

Bug 925318 - Remove first time explanation on how to close the keyboard. r=rudylu
  - Also fixed Bug 905241.
Merge pull request #13568 from comoyo/hu_gone

Bug 936579 - Bring back Hungarian autocorrect. r=RudyL
Merge pull request #13168 from EragonJ/bug-926169

Bug 926169 - add backward compatibility check before landing gecko multi-sim API
Merge pull request #13554 from jmcanterafonseca/fix_fb_index

Bug 936373 - Optimize FB datastore index refresh by tracking revisionId ...
Bug 914093 - Back button for Gaia Keyboard settings page
Merge pull request #13421 from cctuan/932669

Bug 934894 - [Flatfish]CardView snapshot are in portrait
Merge pull request #13430 from zacc/bug_932491

bug 932491 - Address intermittent errors in test_clock_set_alarm_snooze....
bug 937032 - Re-enable more TBPL tests r=me a=testonly
Bug 936533 - test_settings_bluetooth.py is failing, please fix
Bug 936253 - Lock orientation on lockscreen
[Download Manager] New shared component DownloadLauncher