Use a maximum of 2 units when describing comment / thread age.
Let's just use one 'duration' call.
Just show years for stuff older than a year.
Merge pull request #253 from duckduckgo/duration-units

Use a maximum of 2 units when describing comment / thread age.
Release IA pages version: 0.39.0
Merge pull request #255 from duckduckgo/release

Release IA pages version: 0.39.0