* Fix redirect with non-ascii branch names (#4764)

* Add integration tests for non-ascii branch redirect

* Fix mysql test and coverage test

GitLab CE doesn't support multiple assignees for issues.  
That's an enterprise feature.  See: https://docs.gitlab.com/ee/user/project/issues/multiple_assignees_for_issues.html

Signed-off-by: Nicolas Lenz <nicolas@eisfunke.com>

The feature to list commits from a subdirectory is already there but
so far the history link to it was missing. There is a History button
in the view_file.tmpl already so avoid showing two history buttons in
that case.

The GitHub webinterface has the same History button in the same place
so this makes gitea a little bit more compatible.

Signed-off-by: Bernhard Froehlich <decke@bluelife.at>

* Minor fix to TRANSLATORS

Replaced @ with AT and removed " accidentially put in few lines

* Update TRANSLATORS

* Make reverse proxy auth optional

If the option ENABLE_REVERSE_PROXY_AUTHENTICATION is enabled, make
reverse proxy auth optional, instead of failing if the authentication
did not succeed.

Fixes #3973

Signed-off-by: Najib Idrissi <najib.idrissi.kaitouni@gmail.com>

* Update http.go

As we've dropped support for go 1.8 (see 1.5.0 release post),
now we need to ensure that a minimum of go 1.9 builds correctly.

* Update "Upgrade from Gogs" en-us doc

- Move "Change gogs specific information" FROM/TO steps up
  to just beneath matching section header, adjust indention
  and explicitly specify syntax of code sample to provide
  highlighting

- Adjust header levels to match what appears to be the
  intended level, remove trailing decoration (see below)

- Move "Upgrading to most recent ..." section down, remove
  decoration (section header formatting likely covers this
  well enough already)

refs go-gitea/gitea#4286, go-gitea/gitea#3558

* Update "Upgrade from Gogs" fr-fr doc

- Adjust indention and explicitly specify syntax of code
  sample to provide highlighting

- Adjust header levels to match what appears to be the
  intended level, remove trailing decoration since
  section header formatting likely covers this
  well enough already

refs go-gitea/gitea#4286, go-gitea/gitea#3558

* Make sure to reset commit count in the cache on mirror syncing

* reset count of commits in all branches

* Make sure author cannot reject/approve their own PR

* Disable buttons in templates too

* Remove unneccessary if check since the switch below catches it

* Fix IsOwner check

* Update template and remove new template variable

* Add alert template and redirect to diff page on review failure

* Redirect to files diff as a little update to #4632

Signed-off-by: Tosone <i@tosiney.com>

Signed-off-by: Andrew Phillips <theasp@gmail.com>

* Improve URL validation for external wiki  and external issues

* Do not allow also localhost address for external URLs