could not submit add-on - "Ensure this value has at most 50 characters (it has 52)."

[danielnaber]

Describe the problem and steps to reproduce it:

I tried to submit a new add-on, but got: "Ensure this value has at most 50 characters (it has 52).", no matter how much I shortened the name:

Anything else we should know?

This is probably the same issue as https://github.com/mozilla/addons/issues/7487 - the problem went away after I edited one of my i18n files to have a shorter appName.message. The error should be more clear, as I had to check all the translations files (and only was aware that this is about translations because I found the linked issue).