Support Croatian keyboard

Basically Croatian keyboard is QWERTZ layout with extra letters such
as č, ć, đ, ž and š.  This change just introduces Croatian keyboard
subtype and QWERTZ layout which has the extra letters as popup mini
keyboard of base letter.

It might be great if we could have dedidated table layout.

Bug: 4309160
Change-Id: I0fc227295defa56029ca06e406f73833b992be0e
diff --git a/java/res/values/strings.xml b/java/res/values/strings.xml
index 2093f64..93da137 100644
--- a/java/res/values/strings.xml
+++ b/java/res/values/strings.xml
@@ -266,6 +266,8 @@
     <string name="subtype_mode_fr_CA_keyboard">French (Canada) Keyboard</string>
     <!-- Description for French (Switzerland) keyboard subtype [CHAR LIMIT=35] -->
     <string name="subtype_mode_fr_CH_keyboard">French (Switzerland) Keyboard</string>
+    <!-- Description for Croatian keyboard subtype [CHAR LIMIT=35] -->
+    <string name="subtype_mode_hr_keyboard">Croatian Keyboard</string>
     <!-- Description for Hungarian keyboard subtype [CHAR LIMIT=35] -->
     <string name="subtype_mode_hu_keyboard">Hungarian Keyboard</string>
     <!-- Description for Hebrew keyboard subtype [CHAR LIMIT=35] -->