Changes in Special:UserLogin

We reverted our previous changes and stayed with three different templates. Then we fixed again bugs mentioned in [FB#19518](https://wikia.fogbugz.com/default.asp?19518), [FB#19124](https://wikia.fogbugz.com/default.asp?19124). We ran unit and automation tests for that. Also @hyunlim, @owend took a look at our changes. We'd like to merge it to dev on Friday morning Polish time.