Feature: add links in description

[trougnouf]

Add Wikipedia links to descriptions. The parser would need to be aware of the main language (main description) or the language template in use.

eg:
language template without link: {{en|Eddy Merckx metro station entrance}}
language template with link to parse: {{en|[[Eddy Merckx metro station]] entrance}}
language template with link parsed: {{en|[[:en:Eddy Merckx metro station|Eddy Merckx metro station]] entrance}}