I noticed that a translation to German in a tooltip is exactly the opposite of what the original English text says ;)
For reproducing, please insert an autoform or picture into Excel and open the format task pane. Then select the properties as shown below.
In German, the translation should be ... solange das Blatt ungeschützt ist ... or ... solange das Blatt nicht geschützt ist ...
As a question, is the English text To help protect the sheet ... correct? Shouldn't it be To protect the sheet ...?
Additionally, the Protect sheet feature of Excel (2010 and higher) is not on the home tab, but best accessible on the Review tab. Therefore, I suggest to change the text in English accordingly. And in German, the translation would then be ... wählen Sie auf der Registerkarte 'Überprüfen' die Option ...
Note: the same texts are also present in Excel 2010, I guess in Excel 2013 too.