Parse extended info from TermWeb TBX

[nijel]

Describe the problem

TermWeb is a tool for managing terminology and supports TBX export with a lot of additional metadata. Weblate should understand this as much as possible.

Describe the solution you would like

• <descrip type="definition">Explanation</descrip> should be parsed as explanation
• <descrip type="Translation needed">No</descrip> should convert to read-only flag (untranslatable term)
• <termNote type="administrativeStatus">forbidden</termNote> (or obsolete) should convert to forbidden flag
• <descrip type="Usage note">Note</descrip> should be parsed a note

Describe alternatives you have considered

No response

Screenshots

No response

Additional context

Example files: https://github.com/openSUSE/suse-terminology/tree/main/TBX/multilingual/for_Weblate, especially https://github.com/openSUSE/suse-terminology/blob/main/TBX/multilingual/for_Weblate/SUSE_for_Weblate_all_lang_req_fields.xml