Make a string-based federation error, so that they don't have to be translated.

[dessalines]

Requirements

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• Is this a backend issue? Use the lemmy-ui repo for UI / frontend issues.
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Is your proposal related to a problem?

There are many error types in LemmyErrorType which aren't displayed to the user, only in console logs, such as the federation-specific errors. Its pointless to translate them, since they aren't shown in UIs.

Describe the solution you'd like.

Go through the federation code and change the errors to a single string-type one.

Describe alternatives you've considered.

NA

Additional context

#4922 (comment)