Fixed localization of relative time

[kukulich]

Breaking change

Proposed change

It's currently not possible to translate relative time strings right. It does not work in some languages.

In English:

• 1 minute
• 1 minute ago
• In 1 minute

One word "minute"

The same in Czech:

• 1 minuta
• Před 1 minutou
• Za 1 minutu

Three words: "minuta", "minutou", "minutu"

So it's neccessary to translate it as a whole to have the right context.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[kukulich]

Thanks!