Translatable string <Hidden> cannot imported if translated

I've changed the format from <Hidden> to - Hidden -. However, why the Label field should have <> or - - around the label is unclear to me. The three options (Above, Inline or Hidden) are quite OK like this right?

Patch and screenshots attached.

I think it should do some fixes similar to this issue #1317884: Remove all instances of <none>, <Hidden> and <br/> from translatable strings because they lead to import errors

Ah, yes. That would be better I guess. Patch attached.
While working in the file, I applied some Drupal coding standards as well.

FYI:
A similar change was done elsewhere in #1317884: Remove all instances of <none>, <Hidden> and <br/> from translatable strings because they lead to import errors.
The issue about not being able to import strings containing certain special characters (even if you want to) is being discussed in #514926: translated strings shouldn't be validated.

Coding standards are attacked in #1533234: Make field_ui module pass Coder Review - so let's focus on the hidden part.

Allright. Patch attached.

Can we mark either one duplicated. I reopen #1317884: Remove all instances of <none>, <Hidden> and <br/> from translatable strings because they lead to import errors as it doesn't really get committed.

and #8 patch may bring out a security problem :

http://drupal.org/node/514926#comment-6497228

The security is not an issue at all, but I'm ok with duplicating, your choice.

droplet: that other issue was already closed and committed. They just forgot two strings. Can we not just commit this one and leave the other one closed?

Yeah re-read that issue, no point in reopening, let's keep this one.

This needs a re-roll now #1792600: Refactor field_ui so common behavior for fields and display overview screens are extracted got in.

Rerolled because of the move to classes - can go RTBC when it comes back green.

The last line contains a double semicolon.

Oh man .. :)

Committed/pushed to 8.x, thanks!

Backported #16 to D7.

Committed to 7.x - thanks!

(And luckily "Hidden" is already a translatable string in Drupal core before this patch, so we're not actually adding new translatable strings at all here.)