Fix some issues and streamline regeneration process:
- A few glitches (like duplicate language symbols, wrong Windows
language ids etc) were fixed.
- Scripts were added to allow to regenerate the list of supported
locales from the list of known Windows locales.
- Version info when language symbols became available was added to the
documentation of the language symbol enum.
- Synonyms are no longer hard-coded in the script genlang.py.
See #23453.
Closes#23437.
Update the language database from the canonical sources:
- It now includes most locales supported by Windows 10.
- It now also has the following attributes for each entry:
- BCP 47-like locale tag.
- Reference to canonical name for generic language entries.
- Language name in this language itself.
- Also add data file with list of language script identifiers and
aliases based on ISO 15924.
- And update genlang.py to handle all the new attributes and data.
Also move database-related methods of wxLocale to wxUILocale and
just redirect wxLocale methods to the new wxUILocale ones (they are
still preserved for compatibility).
Closes https://github.com/wxWidgets/wxWidgets/pull/2594
