Capitalize "ok"

Critical bug

Author: Furkan Kambay

src/GitHub.Api/Localization.resx

@@ -256,7 +256,7 @@
     <value>GitHub</value>
   </data>
   <data name="Ok" xml:space="preserve">
-    <value>ok</value>
+    <value>OK</value>
   </data>
   <data name="Cancel" xml:space="preserve">
     <value>Cancel</value>
@@ -429,4 +429,4 @@
   <data name="DiscardConfirmYes" xml:space="preserve">
     <value>Discard</value>
   </data>
-</root>
+</root>