Update localisation options to include Español

[hexylena]

What did you do?

• the l10n options in user preferences sample file were missing Spanish, despite it being in ./client/src/nls/
• Updated the user preference selectors to use the localised versions of language names. (though I don't think anyone would be able to find this menu if they didn't speak enough english to get there.)

Open questions: can we remove the locale directory in the root, right? Not touched since 2011/references makos?

Why did you make this change?

@nomadscientist was asking about support for Spanish in the GTN and on EU, I noticed the 'es' directory that wasn't included, and she relates that one of their departments regularly has a group that can work on small en→es translation tasks.

How to test the changes?

(select the most appropriate option; if the latter, provide steps for testing below)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. copy the user-preferences sample to a non-sample version
  2. start galaxy
  3. select Español
  4. ¡Éxito!

License

• I agree to license these contributions under Galaxy's current license.
• I agree to allow the Galaxy committers to license these and all my past contributions to the core galaxy codebase under the MIT license. If this condition is an issue, uncheck and just let us know why with an e-mail to galaxy-committers@lists.galaxyproject.org.

For UI Components

• I've included a screenshot of the changes

¿Donde está la biblioteca? Aqui:

l10n:

[jmchilton]

Thanks!