Better internationalization

[cor3ntin]

• Having an html file per lang is not sustainable, the best solution would be to have a javascript-based solution for dynamic translation

• alternatively, we can have a template system

• Remove the lang selection menu from the HTML file as that unexpectedly clears the unsaved content

[cor3ntin]

See that with @elisabernardoni

[mbonani]

• what I understand blockly cannot be dynamically on the choose of the languages
• template system, I didn't understand
• I think let people choose the languages has to be maintain. It is possible that the browser by default is in english in a classroom or a computer room and that the users wants is own languages. If we can warn the people that the page will be erased or save automatically the code we is the more logical to not permit them to change languages

[mbonani]

probably the change of languages do not need the warning, it could wait next improvment

[cor3ntin]

I looked at the source code, and there isn't that many translations in each html file and they seem easy to translates from either java-script or a code generator ( in order to reduce the number of html file to maintain). However, it is indeed not designed for dynamic translations.

I thought about it and what would be better than a warning would be a local storage.
When you change the lang, it just saves the data, reload the page with the new lang, display the data again.

[mbonani]

I think that could be an improvement we do in a second phase. I don't think people want to change every time languages. It will do it one time and then program.