Add accessibility descriptions for additional non-character keys.

Bug: 6621009
Change-Id: I82fb2dc6af0fda795397e8be8c09a4f53b1656ab
diff --git a/java/res/values/strings.xml b/java/res/values/strings.xml
index 12abf84..9e8c59c 100644
--- a/java/res/values/strings.xml
+++ b/java/res/values/strings.xml
@@ -181,6 +181,12 @@
     <string name="spoken_description_search">Search</string>
     <!-- Spoken description for the "U+2022" (BULLET) keyboard key. -->
     <string name="spoken_description_dot">Dot</string>
+    <!-- Spoken description for the "Switch language" keyboard key. -->
+    <string name="spoken_description_language_switch">Switch language</string>
+    <!-- Spoken description for the "Next" action keyboard key. -->
+    <string name="spoken_description_action_next">Next</string>
+    <!-- Spoken description for the "Previous" action keyboard key. -->
+    <string name="spoken_description_action_previous">Previous</string>
 
     <!-- Spoken feedback after turning "Shift" mode on. -->
     <string name="spoken_description_shiftmode_on">Shift enabled</string>