Add readable unicode point names

Change-Id: I5689711429526a2bad409f235b6825a7ed4c7bc2
diff --git a/java/res/xml/rows_symbols.xml b/java/res/xml/rows_symbols.xml
index 21f7d1d..6d0467c 100644
--- a/java/res/xml/rows_symbols.xml
+++ b/java/res/xml/rows_symbols.xml
@@ -87,9 +87,11 @@
         <Key
             latin:keyLabel="*"
             latin:moreKeys="@string/more_keys_for_star" />
+        <!-- U+2013: "–" EN DASH
+             U+2014: "—" EM DASH -->
         <Key
             latin:keyLabel="-"
-            latin:moreKeys="_,–,—" />
+            latin:moreKeys="_,&#x2013;,&#x2014;" />
         <Key
             latin:keyLabel="+"
             latin:moreKeys="@string/more_keys_for_plus" />