[Merge] lp:~futatuki/mailman/edithtml-lang-select into lp:mailman/2.1

[Yasuhito FUTATSUKI at POEM]

Yasuhito FUTATSUKI at POEM has proposed merging lp:~futatuki/mailman/edithtml-lang-select into lp:mailman/2.1.

Commit message:
Allow to edit templates other than lists preferred language

Requested reviews:
  Mailman Coders (mailman-coders)

For more details, see:
https://code.launchpad.net/~futatuki/mailman/edithtml-lang-select/+merge/349101

This enables to edit templates for available languages without changing preferred_language temporary.

* Add language selecter to template editing page (if the list has multiple available language)
* Add link from editing page to template selection page
-- 
Your team Mailman Coders is requested to review the proposed merge of lp:~futatuki/mailman/edithtml-lang-select into lp:mailman/2.1.
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