A: Yes, Autodesk provides Language Packs for AutoCAD LT 2021 as well. The process is identical.
Remember: Always download from Autodesk, keep your base software updated, and use the dedicated shortcuts to switch between languages. Autocad Language Pack 2021
A: No. The drawing file (DWG) is binary and independent of the UI language. A drawing created in English AutoCAD will open perfectly in Japanese AutoCAD. Only the interface changes, not the geometry or text entities. A: Yes, Autodesk provides Language Packs for AutoCAD