[FIX] orm: when duplicating translated object, modify the values to get more coherent values
user's language: old (untranslated) -> new (translated)
other language: old (untranslated) -> old (translated)

This allows to have coherent behaviour if copy() method is overwritten to change the text (usually applying _('%s (copy)')). The current user will see the translated terms with modification while the translations are kept for others (and need to be updated).
We prefer keeping slightly irrelevant translations (without translated version of '%s (copy)') for other languages than losing it.
[FIX] translations: fix tests to adapt to new duplication behaviour and remove context hack in copy_data (translations are now fully handled in copy_translation)
[FIX] orm: when duplicating translated object, get more coherent source and destination values if default value is specified
user's language: old (untranslated) -> new (translated)
other language: old (untranslated) -> old (translated)

This allows to have coherent behaviour if copy() method is overwritten to change the text (usually applying _('%s (copy)')). The current user will see the translated terms with modification while the translations are kept for others (and need to be updated).
We prefer keeping slightly irrelevant translations (without translated version of '%s (copy)') for other languages than losing it.
The copy_data method does not modify context to get untranslatated values, done fully in copy_translation
[IMP] orm: add missing space in error message during validation
[FIX] fields: execute name_get for function field of type many2one as SUPERUSER_ID (same behaviour as classical many2one)