Merge branch 'feature/chrome-31'

Lock grunt-cli version to 1.2.0.

Bump version to 2.5.18.

Bump version.

Properly localize options_proxyAuthHidePassword.

Do not add BOM when downloading files. Fix #1521.

Fix moz- detection typo. See #1503.

Add moz-extension to sanitize whitelist.

Upgrade angular to 1.7.2.

Upgrade angular to 1.6.9.