Bug 927766: FTE, fix hidden network settings localizability

Add data-l10n-ide to the existing button, make all options for security
localizable
Bug 928499 - Background image
Fix the "now playing" icon that gets sent to the system app
Bug 870266 - Include phone number in the option list from call history.
Bug 922400 - [gallery][homescreen][helix] cannot set wallpaper from gallery
Revert "Merge pull request #11989 from MBRSL/eng-mode"

This reverts commit 5cbabfd0447bae12d87fd5e520e245943f847c7e, reversing
changes made to 6b4f0746b30a8685600435ea96808fc4e1671473.

This broke test_persona_app.py test_persona_app.TestPersonaStandard.test_persona_standard_sign_in
Merge pull request #12941 from flodolo/bug927766

Bug 927766: FTE, fix hidden network settings localizability (r=fcampo)
Merge pull request #12852 from huchengtw-moz/wallpaper/Bug_922400_cannot_set_wallpaper

Bug 922400 - [gallery][homescreen][helix] cannot set wallpaper from gall..., r=djf
Merge pull request #12984 from manzee/master

Bug 870266 - Include phone number in the option list from call history r=rik
Merge pull request #12943 from gitmai/bug-928499-no-background-image

Bug 928499 - Background image (r=fcampo)
Revert "Bug 928885 - xfail test_import_contacts_from_sim because"

This reverts commit b3b08a024fafb93ab25f8b8501cc407ddf18a35e.
Bug 927999 - Feedback error messages need rewriting in proper English

New strings provided by Matej, consider the blank space before ":" as a
typo.
Bug 928283- Added button back
Bug 929285 - Predefine appWindow height with software home button enabled
Bug 929287: Only create mozContact if we don't already have one.
Bug 923152 - Group non-latin names on import contacts
Bug 929479 - Close 'span' elements in lockscreen passcode pad
Bug 928946 - [e.me] Lazy load Banner, ConnectionMessage and Location modules
Bug 929468 - Python fix the way tests use mock_contact.py
Merge pull request #13007 from wanderview/contacts-webidl-delete

Bug 929287: Only create mozContact if we don't already have one.  r=arcturus