Changes

Update de_DE.lang
Just minor changes, didn't want to include following ideas, maybe you
had good reasons to translate it like you did:
of "/give Items" | Translation and explanation instead of "command"
"F��gt zuf��llige Zeichenfolgen hinzu, welche bei der Fehlersuche und
-behebung helfen." | Could be confusing. People could think they should
turn it on to help developing JEI, but I guess it's just an offline
debug thing and nothing gets send to the developer in case of errors?!
61-64: "Strg+Klick" instead of "Strg-Klick" | just looks better imo
 (commit: 6b64e03)

Update de_DE.lang
Minor changes based on wlhlm's response
 (commit: d94cd6e)