add slovak character map for js slug generation

Porting of Django PR #9325, which fixes Django ticket #28768. These
changes were made in Django 2.1.

This adds support for certain Slovak characters when auto-generating
slugs for new pages. This logic is only triggered if
settings.WAGTAIL_ALLOW_UNICODE_SLUGS is set to False; see

http://docs.wagtail.io/en/v2.1.1/advanced_topics/settings.html#unicode-page-slugs

To test, create a new page and enter a title like "Vŕba". The
page's slug field will be automatically set to "vrba". In the
previous behavior, this would instead be automatically set to "vba".

https://github.com/django/django/pull/9325
https://code.djangoproject.com/ticket/28768

CHANGELOG.txt

@@ -13,6 +13,7 @@ Changelog
  * Added `file_hash` field to documents (Karl Hobley, Dan Braghis)
  * Added last login to the user overview (Noah B Johnson)
  * Changed design of image editing page (Janneke Janssen, Ben Enright)
+ * Added Slovak character map for JavaScript slug generation (Andy Chosak)
  * Fix: Query objects returned from `PageQuerySet.type_q` can now be merged with `|` (Brady Moe)
  * Fix: Add `rel="noopener noreferrer"` to target blank links (Anselm Bradford)
  * Fix: Additional fields on custom document models now show on the multiple document upload view (Robert Rollins, Sergey Fedoseev)

docs/releases/2.4.rst

@@ -31,6 +31,7 @@ Other features
  * Added ``file_hash`` field to documents (Karl Hobley, Dan Braghis)
  * Added last login to the user overview (Noah B Johnson)
  * Changed design of image editing page (Janneke Janssen, Ben Enright)
+ * Added Slovak character map for JavaScript slug generation (Andy Chosak)
 
 Bug fixes
 ~~~~~~~~~

wagtail/admin/static_src/wagtailadmin/js/vendor/urlify.js

@@ -58,6 +58,14 @@
         'ů': 'u', 'ž': 'z', 'Č': 'C', 'Ď': 'D', 'Ě': 'E', 'Ň': 'N', 'Ř': 'R',
         'Š': 'S', 'Ť': 'T', 'Ů': 'U', 'Ž': 'Z'
     };
+    var SLOVAK_MAP = {
+        'á': 'a', 'ä': 'a', 'č': 'c', 'ď': 'd', 'é': 'e', 'í': 'i', 'ľ': 'l',
+        'ĺ': 'l', 'ň': 'n', 'ó': 'o', 'ô': 'o', 'ŕ': 'r', 'š': 's', 'ť': 't',
+        'ú': 'u', 'ý': 'y', 'ž': 'z',
+        'Á': 'a', 'Ä': 'A', 'Č': 'C', 'Ď': 'D', 'É': 'E', 'Í': 'I', 'Ľ': 'L',
+        'Ĺ': 'L', 'Ň': 'N', 'Ó': 'O', 'Ô': 'O', 'Ŕ': 'R', 'Š': 'S', 'Ť': 'T',
+        'Ú': 'U', 'Ý': 'Y', 'Ž': 'Z'
+    };
     var POLISH_MAP = {
         'ą': 'a', 'ć': 'c', 'ę': 'e', 'ł': 'l', 'ń': 'n', 'ó': 'o', 'ś': 's',
         'ź': 'z', 'ż': 'z',
@@ -108,6 +116,7 @@
         RUSSIAN_MAP,
         UKRAINIAN_MAP,
         CZECH_MAP,
+        SLOVAK_MAP,
         POLISH_MAP,
         LATVIAN_MAP,
         ARABIC_MAP,