KPD2.1.10: changelog in preparation

ゲームルールOBSOLETE_FOCUS_BRANCHES_VISIBILITYへの対応（KPDModでの追加NFにおいて）
Support for game rule OBSOLETE_FOCUS_BRANCHES_VISIBILITY (in additional NF in KPDMod)
Update Japanese localisaton
Update Japanese localisaton

Changelog:
- Fixed news in Thälmann banishment event sometimes referring to the regime as Nazi regime even in Provisional Government (in rot_news.3.d).
- Removed SOV-related files for better modularization. Instead, Natalia Sedova's name was hardcoded (cannot be translated) at the Soviet Leadership Change event.
- Compatible with ver1.12.12. All vanilla changes in ver1.12.11 and 1.12.12 have been reflected in the mod.
- The flag of Communist Austria was changed to a better one in ver 1.12.1 of vanilla, so I thought that it made less sense to make it different with KPD Mod, so I used the vanilla flag again.

This was KPD2.1.9, but I accidentally uploaded the git system file together, so I uploaded it again.
これがKPD2.1.9だったが、gitシステムファイルを誤って共にアップロードしていたので、再度アップロードし直した。

- Update Japanese localisation files

- Compatible with ver 1.12.10; all changes in ver 1.12.10 are now reflected in the mod.

This was KPD2.1.7, but I accidentally uploaded the git system file together, so I uploaded it again.
これがKPD2.1.7だったが、gitシステムファイルを誤って共にアップロードしていたので、再度アップロードし直した。

- Compatible with ver 1.12.9; all changes in ver 1.12.9 are now reflected in the mod.

- Compatible with ver 1.12.5; all changes in ver 1.12.5 are now reflected in the mod.

Delete the git system file that was accidentally uploaded together and re-upload.

- Compatible with ver 1.12.4; all changes to German focus in 1.12.3 and 1.12.4 are now reflected in the mod.
- Updated Japanese localization files.