Bug 876145: fix authentication dialog in browser (wrong attribute)

Replace l10n-id with data-l10n-id in browser. As it is, the
authentication dialog's title is always displayed in English.
Bug 877960: followup to check the pref by default.
Merge remote-tracking branch 'upstream/master'
merge
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Bug 876703 - [Browser] Make activity filter case insensitive on URL protocol (http://).
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Bug 856074 - Controls on the call screen should be disabled until the call is reported connecting when dialing emergency number in airplane mode
Merge remote-tracking branch 'upstream/master'
Bug 877579 - Items in the awesome list flicker as the user types a URL
[Bug 879292] Cleanup of unused code [r=crdlc]
Merge pull request #10187 from EverythingMe/cleanup-tips-dialogs

[Bug 879292] Cleanup of unused code [r=crdlc]
Bug 879661 - Unit test of internet_sharing.js failed frequently.
Bug 879420 - Prevent default on form submit
Merge pull request #10102 from comoyo/url_bar_flicker

Bug 877579 - Items in the awesome list flicker as the user types a URL. r=daleharvey
Bug 875355 - update font prefs
Trying to stablize the thread_ui test that has been occasionally red in travis - a=npotb