2.1.0: New "age" filter & more translations

Hi!

This feature adds a new age formatter by @seb-jean in #192 & several updated / new translations:

• Update polish translations to be up-to-date by @stloyd in #193
• trans: add german translation for 'age' by @Chris53897 in #194
• add spanish translation for age by @seb-jean in #199

Full Changelog: v2.0.2...v2.1.0

Have fun!