Shorten some ridiculously long message names

Shorten some ridiculously long message names

We don't need to write out that these are from a 'foreign-structured-upload-form',
just 'upload-form' will suffice and isn't ambiguous.

(Updating all the translations too for easy backporting to MW 1.27.)

Changes:

* 'foreign-structured-upload-form-label-own-work'
  -> 'upload-form-label-own-work'
* 'foreign-structured-upload-form-label-infoform-categories'
  -> 'upload-form-label-infoform-categories'
* 'foreign-structured-upload-form-label-infoform-date'
  -> 'upload-form-label-infoform-date'
* 'foreign-structured-upload-form-label-own-work-message-local'
  -> 'upload-form-label-own-work-message-local'
* 'foreign-structured-upload-form-label-not-own-work-message-local'
  -> 'upload-form-label-not-own-work-message-local'
* 'foreign-structured-upload-form-label-not-own-work-local-local'
  -> 'upload-form-label-not-own-work-local-local'
* 'foreign-structured-upload-form-label-own-work-message-default'
  -> 'upload-form-label-own-work-message-default'
* 'foreign-structured-upload-form-label-not-own-work-message-default'
  -> 'upload-form-label-not-own-work-message-default'
* 'foreign-structured-upload-form-label-not-own-work-local-default'
  -> 'upload-form-label-not-own-work-local-default'
* 'foreign-structured-upload-form-label-own-work-message-shared'
  -> 'upload-form-label-own-work-message-shared'
* 'foreign-structured-upload-form-label-not-own-work-message-shared'
  -> 'upload-form-label-not-own-work-message-shared'
* 'foreign-structured-upload-form-label-not-own-work-local-shared'
  -> 'upload-form-label-not-own-work-local-shared'

Change-Id: Ia8c51cf1143c659e707efd846c4ece00b0d08f96