[openstreetmap/openstreetmap-website] Add building=cowshed and building=sty to en.yml (Issue #3449)

[Hufkratzer]

### Description

Add [building=cowshed](https://wiki.openstreetmap.org/wiki/Tag:building%3Dcowshed) and [building=sty](https://wiki.openstreetmap.org/wiki/Tag:building%3Dsty)  to en.yml so that they can be translated. ([building=stable](https://wiki.openstreetmap.org/wiki/Tag:building%3Dstable) is already there).

### Screenshots

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