Merge branch '0.9.x' into json-activities

* 0.9.x:
  * update translator documentation. * remove superfluous whitespace. * tab to spaces. * add FIXME for undocumented class.
  * update translator documentation. * remove superfluous whitespace. * L10n updates. * small refactoring in publicrss.php. * remove PHP4-isms
  Localisation updates from http://translatewiki.net.
  Double quotes to single quotes.
  * improve L10n consistency for English. For example proper punctuation for all button and label titles. * fix some i18n bugs (in-message variables). * update/add translator documentation. * remove superfluous whitespace.
  add path separators for Plugin::path()
  argument to send email summary to all users on all sites
  fix indentation in siteemailsummaryhandler
  fix indentation in sendemailsummary.php
  fix indentation in Email_summary_status.php
  fix indentation in EmailSummaryPlugin.php
  fix indentation in usermailsummaryhandler.php