Combine i18n template tag tests

[Preston Timmons]

I was working on #25372 and noticed there isn't an obvious place to add extra tests. This is because the i18n tag tests are currently split among i18n and template_tests.syntax_tests.test_i18n. I think these tests should be combined in one place or the other.

I propose the following:

1) Move the tag-related tests from i18n into template_tests
2) Split template_tests.syntax_tests.test_i18n into separate files for each tag (test_trans.py, test_blocktrans.py, etc.)

I think change 1 makes sense because template_tests is also where we have tests for things like staticfiles, cache, etc. The timezone tags are the only outlier here.

Change 2 is a pattern we adopted when converting the filter tests to unit tests. I think it would be good for template tag tests to follow the same pattern.

Does this seem like the right grouping?

[Tim Graham]

Sounds good to me.

[Aleksandr Sobolev]

Create pull request with three commits:
​https://github.com/django/django/pull/7363

[Tim Graham]

Thanks for the patch. The correct ​triage action is to check "Has patch"' when adding a pull request. "Ready for checkin" is set by the person who reviews the patch.

[Aleksandr Sobolev]

Sorry, my fault. Next time I'll avoid such mistakes.

[Andy Craze]

Added a PR with all the i18n template tags reorganized into syntax_tests/i18n:
​https://github.com/django/django/pull/7724

[Tim Graham]

Please uncheck "Patch needs improvement" on the ticket after updating the PR for the comments.

[Tim Martin]

The patch looks good to me, but IIUC you need to squash it into a single commit with a message following the correct commit message format.

[Tim Graham <timograham@…>]

In 97c1931c:

Fixed #24423 -- Reorganized i18n tag tests.

[Tim Graham <timograham@…>]

In a6b5321:

Refs #24423 -- Readded inadvertently deleted i18n tests.

Mistake in 97c1931c4f610e80053430d0297d51e1bed1e7ae.

[Tim Graham <timograham@…>]

In 49de4f15:

[1.11.x] Refs #24423 -- Readded inadvertently deleted i18n tests.

Mistake in 97c1931c4f610e80053430d0297d51e1bed1e7ae.

Backport of 357a6428980961b2c5311eb75d16229c7fc0d982 from master