Once set for the loading of terms for a lang,
the flag `overwrite` was propagated to all
other following languages, even if not actually needed.
Use case:
- Installed languages: en_US, de, fr_CH, it
- Update of the `sale` module
- In `load_module_terms`, the system iterates through the languages:
1. en_US: No problem
2. de: No problem
3. fr_CH: The flag `overwrite` is set to `True`,
because the sub-language `fr_CH` should overwrite the `fr` terms
4. it: The flag is still set to `True`, because of the previous iteration,
while it must not.
opw-654042
ff2910f8f2