Refactor comma key value text to strings.xml

Author: yawnoc

app/src/main/res/values/strings.xml

@@ -31,6 +31,9 @@
   <string name="file_name__about_html">about.html</string>
   <!-- Backspace: U+232B ERASE TO THE LEFT -->
   <string name="display_text__backspace" translatable="false">⌫</string>
+  <!-- Comma: U+002C COMMA, U+FF0C FULLWIDTH COMMA -->
+  <string name="value_text__qwerty_comma" translatable="false">,</string>
+  <string name="value_text__strokes_comma" translatable="false">，</string>
   <!-- Space bar: U+25C0, U+25B6 (triangles) -->
   <string name="display_text__qwerty_space_bar">◀ English ▶</string>
   <string name="display_text__strokes_space_bar">◀ Chinese ▶</string>

app/src/main/res/xml/keyboard_qwerty.xml

@@ -102,7 +102,7 @@
     />
     <!-- Comma -->
     <Key
-      app:keyValueText=","
+      app:keyValueText="@string/value_text__qwerty_comma"
       app:keyWidth="@dimen/key_width__digit"
     />
     <!-- Space bar -->

app/src/main/res/xml/keyboard_qwerty_symbols.xml

@@ -82,7 +82,7 @@
     />
     <!-- Comma -->
     <Key
-      app:keyValueText=","
+      app:keyValueText="@string/value_text__qwerty_comma"
       app:keyWidth="@dimen/key_width__digit"
     />
     <!-- Space bar -->

app/src/main/res/xml/keyboard_strokes.xml

@@ -91,9 +91,9 @@
       app:keyTextOffsetY="@dimen/baseline_correction__switch_key"
       app:keyIsPreviewable="false"
     />
-    <!-- U+FF0C FULLWIDTH COMMA -->
+    <!-- Comma -->
     <Key
-      app:keyValueText="，"
+      app:keyValueText="@string/value_text__strokes_comma"
       app:keyWidth="@dimen/key_width__digit"
     />
     <!-- Space bar -->

app/src/main/res/xml/keyboard_strokes_symbols_1.xml

@@ -86,9 +86,9 @@
       app:keyTextOffsetY="@dimen/baseline_correction__switch_key"
       app:keyIsPreviewable="false"
     />
-    <!-- U+FF0C FULLWIDTH COMMA -->
+    <!-- Comma -->
     <Key
-      app:keyValueText="，"
+      app:keyValueText="@string/value_text__strokes_comma"
       app:keyWidth="@dimen/key_width__digit"
     />
     <!-- Space bar -->

app/src/main/res/xml/keyboard_strokes_symbols_2.xml

@@ -63,9 +63,9 @@
       app:keyTextOffsetY="@dimen/baseline_correction__switch_key"
       app:keyIsPreviewable="false"
     />
-    <!-- U+FF0C FULLWIDTH COMMA -->
+    <!-- Comma -->
     <Key
-      app:keyValueText="，"
+      app:keyValueText="@string/value_text__strokes_comma"
       app:keyWidth="@dimen/key_width__digit"
     />
     <!-- Space bar -->