[stable6] Backported incorrect translation texts for German

[PVince81]

Fixes #6585

While comparing the branches I found additional completely invalid texts (the second commit) so I've included them.

Please review @karlitschek @DeepDiver1975 @schiesbn @nickvergessen

[karlitschek]

👍 but please use "Sie" instead of "Du"

[PVince81]

@karlitschek I just double checked and the whole "de.php" file on stable6 is using "Du", so I think this change is correct.
The "Sie" is used in "de_DE.php"

[karlitschek]

true. Sorry for the noise

[nickvergessen]

Shouldn't that be "%s hat »%s« mit dir geteilt" because the item is still shared?

[PVince81]

Maybe, but that's the translation text I found on master. Might be something to discuss on Transifex.

[Niduroki]

👍

[ghost]

💣 Test Failed. 💣
Refer to this link for build results: https://ci.owncloud.org/job/pull-request-analyser/3370/

[PVince81]

I've raised #7436 to fix that unit test failure due to PHP trying to be clever.

[PVince81]

@owncloud-bot retest this please

[scrutinizer-notifier]

The inspection completed: No new issues

[ghost]

🚀 Test Passed. 🚀
Refer to this link for build results: https://ci.owncloud.org/job/pull-request-analyser/3379/

[DeepDiver1975]

👍