Merge pull request #16765 from flodolo/dialer_ampm_l12y

Bug 977145 - [dialer] Make AM/PM localizable when displaying clock
Bug 982260 - Disable Contacts details_test.js, r=gwagner
Merge pull request #17170 from jonallengriffin/disable_test

Bug 982260 - Disable Contacts details_test.js, r=gwagner
Bug 949051 - Add Firefox Accounts to Settings app
Bug 964390 - Hide fxa settings UI behind a pref
Bug 974185 - Allow firefox accounts verification to be canceled
Pass FxAccountsIACHelper explicitly into panel from panel_loader
Use LazyLoader to ensure panel_loader doesn't init panel before deps are ready.
Fix typo in panel loader and remove overlay.
Work around FxAccountsIACHelper data format inconsistency
Check if FxA is preffed off via JS, not DOM