cy (Welsh) locale: fix various problems
cy (Welsh) locale: fix various problems

The latest updates had several problems, which are fixed
in this commit, e.g.

* Malformed links
* Broken uses of variables (e.g. translating the 'date' in
  '{{date}}')

Additionally, I've stripped unnecessary space around many HTML
tags that may cause the text rendering to look odd.

TEDICpy/QueremoSaber,Br3nda/alaveteli,4bic/alaveteli,andreicristianpetcu/alaveteli,datauy/alaveteli,andreicristianpetcu/alaveteli,4bic/alaveteli,codeforcroatia/alaveteli,codeforcroatia/alaveteli,nzherald/alaveteli,Br3nda/alaveteli,obshtestvo/alaveteli-bulgaria,codeforcroatia/alaveteli,datauy/alaveteli,Br3nda/alaveteli,petterreinholdtsen/alaveteli,4bic/alaveteli,nzherald/alaveteli,4bic/alaveteli,TEDICpy/QueremoSaber,nzherald/alaveteli,obshtestvo/alaveteli-bulgaria,10layer/alaveteli,obshtestvo/alaveteli-bulgaria,10layer/alaveteli,andreicristianpetcu/alaveteli_old,obshtestvo/alaveteli-bulgaria,codeforcroatia/alaveteli,TEDICpy/QueremoSaber,TEDICpy/QueremoSaber,datauy/alaveteli,andreicristianpetcu/alaveteli,obshtestvo/alaveteli-bulgaria,andreicristianpetcu/alaveteli,Br3nda/alaveteli,petterreinholdtsen/alaveteli,10layer/alaveteli,andreicristianpetcu/alaveteli_old,nzherald/alaveteli,Br3nda/alaveteli,petterreinholdtsen/alaveteli,petterreinholdtsen/alaveteli,andreicristianpetcu/alaveteli_old,nzherald/alaveteli,andreicristianpetcu/alaveteli_old,petterreinholdtsen/alaveteli,TEDICpy/QueremoSaber,andreicristianpetcu/alaveteli,4bic/alaveteli,andreicristianpetcu/alaveteli_old