[locale] Fix wrong calendar() output in 'be' localisation

[mikitasolo]

fixes #4502
@demidov91, there was wrong regexp (I assume be localisation was copied from ru and Вв was not changed by Уу) and that caused wrong output of calendar() function (Неправильно брались падежи)

[marwahaha]

@Oire any thoughts ?

[DmitryScaletta]

As a native speaker, I can confirm that's correct.
And @SobakaSlava, maybe we should use Ууў instead of Уу?

[mikitasolo]

@DmitryScaletta are there any cases of using ў? If yes, then i will add it.

[marwahaha]

@DmitryScaletta @SobakaSlava shall I merge this?

[mikitasolo]

@marwahaha Yes, sure

[marwahaha]

@SobakaSlava - can you add a test?

[mikitasolo]

@marwahaha actually it seems like the tests are already done for this case

[marwahaha]

@SobakaSlava - to prevent this issue in the future, it'd be great to check in an additional test of the exact issue you have, to ensure that this change is what you want.

[marwahaha]

Ok, I tried pushing to your branch but I didn't have access.

Please add the following to src/test/locale/be.js:

test('calendar should format', function(assert) {
  assert.equal(moment('2018-04-13').calendar(moment('2018-04-16')), "У мінулую пятніцу ў 00:00", "calendar should handle day of week");
})

This was the old behavior, which I assume is unexpected.

test('calendar should format', function(assert) {
  assert.equal(moment('2018-04-13').calendar(moment('2018-04-16')), "У мінулую пятніца ў 00:00", "calendar should handle day of week");
})

[mikitasolo]

@marwahaha sorry for a long wait. I've added the test.

[coveralls]

Coverage increased (+0.07%) to 94.756% when pulling 0d5c531 on SobakaSlava:develop into aba77ec on moment:develop.

[itech-dzmitry]

Thanks for improvement! Excuse me for being not available during the conversation.

[mikitasolo]

@marwahaha Ready to review