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2. Add F5 Tools --> Theme Select menu to swith between themes

(#1245)

Update Traditional Chinese strings

Korean Update

2. Call chkdsk to fix the volume before shrink.

Create  Grub Help de_De.txt

@ventoy 

Please check and merge. Thanks.

translated the new strings

ventoy.json must in UTF-8 encoding. The BOM is auto skipped if exist.