send email subject utf-8 encoded

redefine some traditional chinese translation after user's feedback

prevent session fixation for external authentication

This reverts commit 55c385e96e6594ec1ac3b5cd41ccd2df6048b696, reversing
changes made to 61bb29d492.

Bump to Lucene 5.2.1

Added better logging for fail2ban

Add traditional Chinese translation

it's for zh_TW(Taiwan)

fix feed link from user's repository page

Fix tags not properly indexed in Lucene

  + use request instead of session to flag authentication status
    and user, for external authentication types

All tags that reference to particular object are stored in a list within a map.
There is a if statement that inits empty list when there are not references
to the current object yet, but the boolean expression checks for the wrong value.

sort projects displayed on projects page