Describe the bug
Some errors are hardcoded to return in German language

To Reproduce
https://github.com/google/site-kit-wp/blame/9a262cd18c33995ce5ec81bc300ff055dff2a153/includes/Core/Storage/Data_Encryption.php#L123
https://github.com/google/site-kit-wp/blame/9a262cd18c33995ce5ec81bc300ff055dff2a153/includes/Core/Storage/Data_Encryption.php#L143

There may be more. I found these while referencing #7

Expected behavior
Errors and/or code should preferably be English to enhance collaboration