Add intl & fr/en/it/de lngs

[SebFox2011]

I have introduce fr, en , it, and de language in the web meshtastic application.
It now use langage detector to display the right langage.

More trads to come...

Thanks for reviewing my mr :)

[fifieldt]

Thank you for putting in such a huge effort, and thank you for being patient in waiting for review :)

This looks good, aside from those two inadvertent file inclusions.

However, I think we need to check how this might affect the embedded web servers on hardware devices. The extra strings take up a bit of space, so we need to make sure there is space for that :)