add arabic as a usable language

Add language settings to Japanese then we can use Raindrop in Japanese.

Title says it all :)

Add Chinese Traditional for Taiwan, Hong Kong and other chinese comunities

In the actual spanish version of Raindrop there are some "hilarious" translations like "show" = "espectáculo". The correct form is "mostrar" because "espectáculo" in spanish really means "espectacle" o "enterteiment". There are another little mistakes or not translated strings that if you want I can help to translate correctly, I only need a text file with all strings. Thanks for your great work with Raindrop ;-)

Add Vietnamese as supported language

Instead of "Wszystkio zakładki" there should be "Wszystkie zakładki"