FEATURE: Adds transliteration of German umlauts in slugs

- Moves the already existing transliteration rules into `transliterations.en.yml` (there's no need to translate this for every language). The same goes for the stringex configuration.
- Doesn't calculate the default slug for *zh_CN* and *ja* anymore. It hasn't been used anyway since stringex is used instead.
- Removes a wrong comment from the Russion transliteration file (I hate wrong comments)

config/locales/server.en.yml

@@ -15,18 +15,6 @@
 # http://yamllint.com/
 
 en:
-  stringex:
-    characters:
-      ellipsis: ""
-      number: "-"
-  # some default transliteration rules may be missing, add them to your locale
-  i18n:
-    transliterate:
-      rule:
-        ț: "t"
-        Ț: "t"
-        ș: "s"
-        Ș: "s"
   dates:
     short_date_no_year: "D MMM"
     short_date: "D MMM, YYYY"

config/locales/transliterate.de.yml

@@ -0,0 +1,18 @@
+# encoding: utf-8
+#
+# This file contains transliteration rules for German
+#
+# To validate this YAML file after you change it, please paste it into
+# http://yamllint.com/
+
+de:
+  i18n:
+    transliterate:
+      rule:
+        Ä: "Ae"
+        Ö: "Oe"
+        Ü: "Ue"
+        ß: "ss"
+        ä: "ae"
+        ö: "oe"
+        ü: "ue"

config/locales/transliterate.en.yml

@@ -0,0 +1,20 @@
+# encoding: utf-8
+#
+# This file contains default transliteration rules and configures stringex
+#
+# To validate this YAML file after you change it, please paste it into
+# http://yamllint.com/
+
+en:
+  stringex:
+    characters:
+      ellipsis: ""
+      number: "-"
+  # some default transliteration rules may be missing, add them to your locale
+  i18n:
+    transliterate:
+      rule:
+        ț: "t"
+        Ț: "t"
+        ș: "s"
+        Ș: "s"

config/locales/transliterate.ru.yml

@@ -2,9 +2,6 @@
 # This file contains content for the i18n transliteration map from
 # Russian Cyrillic to ASCII (ISO-9:1995 / GOST 7.79-2000, table B)
 #
-# To work with us on translations, see:
-# https://www.transifex.com/projects/p/discourse-pt-br/
-#
 # To validate this YAML file after you change it, please paste it into
 # http://yamllint.com/
 

lib/slug.rb

@@ -4,8 +4,6 @@
 module Slug
 
   def self.for(string)
-    slug = string.gsub("'", "").parameterize
-    slug.gsub!("_", "-")
     # TODO review if ja should use this
     # ko asked for it to be removed
     if ['zh_CN', 'ja'].include?(SiteSetting.default_locale)
@@ -13,6 +11,9 @@ module Slug
         require 'stringex_lite'
       end
       slug = string.to_url
+    else
+      slug = string.gsub("'", "").parameterize
+      slug.gsub!("_", "-")
     end
     slug =~ /[^\d]/ ? slug : '' # Reject slugs that only contain numbers, because they would be indistinguishable from id's.
   end