* an inactive user shouldn't be able to be a collaborator

* use translated error message

* add active user check when adding a new collaborator via the api

* fix translation text

* added collaborator test

* improvee testcases

* don't fail silently if trying to add a collaborator twice

* fix translation text

* added collaborator test

* improvee testcases

* Added tests to make sure a collaborator cannot be added twice

* Add is_writable checkbox to deploy keys interface

* Add writable key option to deploy key form

* Add support for writable ssh keys in the interface

* Rename IsWritable to ReadOnly

* Test: create read-only and read-write deploy keys via api

* Add DeployKey access mode migration

* Update gitea sdk via govendor

* Fix deploykey migration

* Add unittests for writable deploy keys

* Move template text to locale

* Remove implicit column update

* Remove duplicate locales

* Replace ReadOnly field with IsReadOnly method

* Fix deploy_keys related integration test

* Rename v54 migration with v55

* Fix migration hell