localize 404 page; allow Markdown at more places; clickable feature icons (#184)

* allow Markdown in clients (sub)title

* localize 404 page

* add Markdown support for recent posts title

* allow Markdown in see_more section strings

* allow Markdown in features names

* make feature icons clickable (hyperlinks)

* allow Markdown in credits strings; better bootstrapious link

* make see_more section more flexible:

avoid Hugo error(s) when `params.see_more.link_url` or `params.see_more.link_text` aren't defined

* rename `link` key into `url` to be consistent:

- since in the client YAML files the respective key is names `url`, I guess
  I should stick to that.

- besides I've removed the one `#` I've specified as the URL in
  `data/features/webdesign.yaml`; originally that was intended as a "visual"
  hint that now it is easily possible to make the features clickable. but I
  guess that's not really necessary, if not even irritating.

* layouts: remove double logo from 404

the changes in this commit are identical with timmn's commit 33ad328776eeb90f6d6793f7036fcb3338fb5155

* rename string  to

* translate remaining Catalan 404 strings

* improve documentation of feature YAML files

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