Language support

[xeon-zolt]

I'm submitting a ... (check one with "x")

• bug report
• feature request
• support request => Please do not submit support requests here, instead ask your query in out Gitter channel at https://gitter.im/fossasia/meilix

I would love if I can choose a default language too as most of the live ISO comes with English by default
and not everyone is sure how to change the language or how to even read the language (following that it should be for web app too)