Refactor switch to strokes to strings.xml

but only because it appears in more than one keyboard

Author: yawnoc

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

@@ -31,6 +31,10 @@
   <string name="file_name__about_html">about.html</string>
   <!-- Backspace: U+232B ERASE TO THE LEFT -->
   <string name="display_text__backspace" translatable="false">⌫</string>
+  <!-- Switch to strokes: U+31D0, U+31D1, U+31D2 -->
+  <string name="display_text__switch_to_strokes" 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>

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

@@ -80,7 +80,7 @@
     <!-- Switch to strokes keyboard: U+31D0, U+31D1, U+31D2 -->
     <Key
       app:keyValueText="SWITCH_TO_STROKES"
-      app:keyDisplayText="㇐㇑㇒"
+      app:keyDisplayText="@string/display_text__switch_to_strokes"
       app:keyTextColour="@color/stroke_key_text"
       app:keyTextSize="@dimen/font_size__switch_key"
       app:keyTextOffsetY="@dimen/baseline_correction__switch_key"

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

@@ -57,7 +57,7 @@
     <!-- Switch to strokes keyboard: U+31D0, U+31D1, U+31D2 -->
     <Key
       app:keyValueText="SWITCH_TO_STROKES"
-      app:keyDisplayText="㇐㇑㇒"
+      app:keyDisplayText="@string/display_text__switch_to_strokes"
       app:keyTextColour="@color/stroke_key_text"
       app:keyTextSize="@dimen/font_size__switch_key"
       app:keyTextOffsetY="@dimen/baseline_correction__switch_key"