bug 913701, fix burning browser db operator variant customization test.
Merge pull request #12003 from nullaus/browser-test-fix

bug 913701, fix burning browser db operator variant customization test.
[webapp-optimize] add <meta name=locales> when GAIA_CONCAT_LOCALES is true
[webapp-optimize] Translation dictionaries are now AST objects with type and body
[build] Add shared/js/l10n.js to lint-exluded-files (we're linting in our repo)
[multilocale] Copy official and unofficial branding files in multilocale.py
[tests] Update l10n tests in the Gallery app
[tests] Use MockL10n for Video app tests
[tests] Fix tests in communications/dialer
Land L20n/webl10n