Add default language in settings tab if not present

[Sujanadh]

Updates:

• Added portuguese translation label of geometry and survey group in mandatory fields
• Added default language in settings tab if not present
• Avoid overwriting the settings tab instead add/update mandatory fields in them, such as form_id, version, and form_title

Related Issues:

• Allow for selection of additional settings when merging XLSForms #316
• Improve handling of question translations in XLSForm (with Brazilian Portuguese as a priority) fmtm#2080

[spwoodcock]

This is a great improvement 👍

Currently I don't think we handle the standard label field without any language, but we can address that later

[Sujanadh]

We do handle the standard label field, if it is only label field without any language then we add english(en) by default, label -> label::english(en)

[spwoodcock]

Oh cool, I missed that! 😄

https://github.com/hotosm/osm-fieldwork/blob/main/osm_fieldwork%2Fupdate_xlsform.py#L125-130

Good approach 👍