Update of translation contribution wiki page

[Johnny Jazeix]

Hi,
I've updated the wiki page at https://gcompris.net/wiki/How_to_translate

Can you check if there are missing information or do improvements (better
wording...)? The goal is to have a unique helper page for people who would
want to help but don't have much knowledge about KDE or translation with
all the content to be translated.

Cheers,

Johnny
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