i18n: update translation

feat: finish work of release

- bump up version to 4.2
- update document about translation.

doc: modify document to mark changes

- add universal encoding infos in documentation.
- bump up version to 4.1 for release.

doc: translate documentation

fix: fix various trivial issues

- update blender_manifest.toml to the latest version and fix the issues raised by blender when packaging.
- use blender do packaging work. remove redist.py because blender_manifest.toml has gitignore like filter feature when packaging.
- update document about installing, configurating, building plugin for blender 4.2.
- update a document image for blender 4.2.

feat: add blc params in exporter. fix bme.

- add ballance params section and successive switch in virtools file exporter to allow user manually cancel sector group ensurance which give user a way to export component, not the whole level.
- add mirror matrix detection in bme creation. a mirror matrix will reverse triangle indice order. we need reverse it again when facing mirror matrix. this resolves the issue when applying term 3.
- use mirror, not rotation to create straight floor in bme which give a better looks in game.

add swing series adder

finish specific flatten uv

[doc] bump up version. fix document.

- bump up version to 3.3
- fix documents
  * rewrite the supported version.
  * update suggested plugin link.
  * notify user some installation changes. order user change installation folder.

[doc] add document for flatten uv and bump up version.

- add document for flatten uv
- bump up version to 3.2