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Re: override en_US termsby
ask yourself why a separate German Translation beside Transiflex, which is much better (corrected) than the original one, has been created at all. Odoo knows about it already by the way. It is available and could be uploaded to transiflex as you mentioned but I guess it won't be done, for whatever reasons.
This way you have quite a lot of other Odoo pearls which probably will never get integrated or even known by others.