Fix a.control-select bug in div#share-publish-buttons for Worksheet and Revisions
Spanish translation completed
A lot of Typos fixed and first comments added
Upload - subir issues fixed
title in links - clave-contraseña and minor typos
Present to infinitive and minor typos
Typos pointed out by  saraedum
Themes infrastructure
themes rendering and Test theme
themes running except worksheets
Themes on worksheets - Help added
Themes added and Test theme removed
Merge branch 'spanish-translation' into server

* spanish-translation:
  Typos pointed out by  saraedum
  Present to infinitive and minor typos
  title in links - clave-contraseña and minor typos
  Upload - subir issues fixed
  A lot of Typos fixed and first comments added
  Spanish translation completed
Merge branch 'themes' into server

* themes:
  Themes added and Test theme removed
  Themes on worksheets - Help added
  themes running except worksheets
  themes rendering and Test theme
  Themes infrastructure