Fix recurring languages in language dropdown menu #951 #986
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This is to fix #951.
The problem was in dhtmlx_languages() in translate.py, that result set was not working properly to resolve the duplication.
I've changed the result set to a dictionary with code as the key, and use setdefult() to neglect the duplication. Then change it back to a list for return.
There's no duplication after the fix.
