This adds a new setting in "Translation settings" called "Show romanizations" which tells the translation popup to include in the query the parameter dt=rm and then extracts romanizations from the results to display.
Update translator.lua to use a still working google translate API.
Add a method to show translations (main and alternates) in
a TextViewer.
Re-enable "Translate" button in text selection/highlight buttons
dialog.
Target language can be set with a manually added setting:
translator_target_language = "fr"
and will fallback to the UI language.
