"Original language: de (German)"独語版 又は オリジナルが英語版の場合 (: en (English))
This means that no english translation is available. If the original language is English, this will also be indicated.
"translation: en (English)"DIN による公式翻訳英語版
This means that an official translation published by DIN is available.
"manuscript: en (English)"DIN 以外 による非公式翻訳英語版
This means that an English translation is available, prepared by an external source (e.g. a company or translation agency), but not checked or revised by DIN translation staff.