* Add Hebrew language flag (the flag of Israel)
* Update the language list (lang.html.full) to include Hebrew
* Use POT as a basis for yet untranslated files, instead of the Russian
  translation files; this should also ensure Transifex doesn't report 100%
  translations for these files, instead of 0%
* Update Hebrew translation of priority.po

     and '4d0b70127180614ecd593fe5a212cbe360238a97'

     and '3330bd7022f21429c8c046327c6599339d180f4c'

Add link to streaming spec on doc index

Translators should ensure the title lines are the correct length.