Add out of the box i18n support

[Geert]

Add translate options for built-in templates (including those of ml-search-ng) using angular-translate, provide dynamic locale, and a flag toggle in the header tied to plumbing in rootCtrl.

[Geert]

    "angular-translate-loader-static-files": "^2.16.0",
    "flag-icon-css": "^2.9.0",
    "angular-dynamic-locale": "^0.1.32",
    "angular-i18n": "^1.6.7"