* fix(mobile): Mark more strings for translation
Moving more strings to the `i18n` JSON file, and also including their
es-US translations.
* Add more translatable strings
* refactor: move all extensions to separate package
* refactor(mobile): add BuildContext extension
* refactor(mobile): use theme getters from context
* refactor(mobile): use media query size from context
* refactor(mobile): use auto router methods from context
* refactor(mobile): use navigator methods from context
---------
Co-authored-by: shalong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>