Originally caused by 90c4e2e6ec [which did not translate the tooltip
descriptions for enum items at all]
That was fixed in cbc5d861db [which was working fine for the default
translation context -- which is most of the time]
Now 7d7318f6c5 added the `BLT_I18NCONTEXT_ID_ID` translation context
to `buttons_context_items` (rightfully so) but using this context on the
enum item **description** translation does not really make sense. So as
a result, the description was not translated in this case.
To resolve, now dont use a special translation context for the
**description** of enum items at all, this is also what
`property_enum_translate` does.