Add tests to date format translation UI

that got in! yay.

1. +++ b/lib/Drupal/config_translation/Tests/ConfigTranslationOverviewTest.php
   @@ -107,4 +107,25 @@ class ConfigTranslationOverviewTest extends WebTestBase {
   +    $this->assertText('HTML Date');
   +    $this->assertLinkByHref('admin/config/regional/date-time/formats/manage/html_date/translate');
   +    $this->assertText('HTML Year');
   +    $this->assertLinkByHref('admin/config/regional/date-time/formats/manage/html_year/translate');
   

   above, it is testing all the hidden languages (or all those from core).

   But the date formats are only testing a couple of the hidden ones. A comment here about that might be more clear.

   Something like:
   // Hidden date formats are only available to translate through the configuration translation listings. Test a couple of them.

2. +++ b/lib/Drupal/config_translation/Tests/ConfigTranslationUiTest.php
   @@ -368,6 +368,62 @@ class ConfigTranslationUiTest extends WebTestBase {
   +    // Check for medium format.
   

   strictly speaking I think we should make our own format unless we are testing specifically translating built in formats.

3. +++ b/lib/Drupal/config_translation/Tests/ConfigTranslationUiTest.php
   @@ -368,6 +368,62 @@ class ConfigTranslationUiTest extends WebTestBase {
   +    foreach(array('medium', 'custom_medium') as $id) {
   

   oh, maybe here we are now testing that we can translate a default format and a custom one. Oh, no. Well. medium is a default format, but not a hidden system one.

4. +++ b/lib/Drupal/config_translation/Tests/ConfigTranslationUiTest.php
   @@ -368,6 +368,62 @@ class ConfigTranslationUiTest extends WebTestBase {
   +      // Make sure original text is present on this page.
   +      $this->drupalGet($translation_base_url, $this->getUrlOptions('add', 'fr'));
   +      $this->assertText($label);
   

   how is asserting label checking if the original text is present?

no patch now. gotta run.

Still failing locally, but some issues fixed.

w00t!