Fix long date format for Czech

[radekdostal]

Removed nonbreaking spaces from "L" long date format.

[ichernev]

@petrbela what do you think?
@radekdostal you need to change the tests too.

[radekdostal]

@ichernev Tests were changed.

[petrbela]

👍

[enumag]

@ichernev This should be reverted. The correct czech format is actually WITH the spaces. It is often use without them but that's a mistake. Should I send pull request?

[petrbela]

According to https://cs.wikipedia.org/wiki/Wikipedie:Typografick%C3%A9_rady#Datum, it should be either 23. 2. 2016 (with spaces) or 23.02.2016 (with padded 0 without spaces). I think the first form should be what format('l') produces, and the second one format('L').

I think the norm will change again in the next iteration anyway, but for now, if you can make a PR fixing the l format, I think we should be good.