Use "unknown emoji" or emoji that has an empty translation

Because the number of emoji description spoken string resources is
rather huge (~800), some locales may chose an empty description as a
translation. If that is the case, we will announce "unknown emoji" as
a fallback.

Bug: 11452158
Change-Id: Ibb65e5bec93030c40bd33ac2be2115c3bbc8bd11
diff --git a/java/res/values/strings-talkback-descriptions.xml b/java/res/values/strings-talkback-descriptions.xml
index 14455d0..d7978b0 100644
--- a/java/res/values/strings-talkback-descriptions.xml
+++ b/java/res/values/strings-talkback-descriptions.xml
@@ -128,11 +128,13 @@
     <string name="spoken_descrption_emoji_category_emoticons">Emoticons</string>
 
     <!-- Description of an upper case letter of LOWER_LETTER. -->
-    <string name="spoke_description_upper_case">Capital <xliff:g id="LOWER_LETTER" example="A, E, ligature">%s</xliff:g></string>
+    <string name="spoken_description_upper_case">Capital <xliff:g id="LOWER_LETTER" example="A, E, ligature">%s</xliff:g></string>
     <!-- Spoken description for Unicode code point U+0049: "I" LATIN CAPITAL LETTER I
          Note that depending on locale, the lower-case of this letter is U+0069 or U+0131. -->
     <string name="spoken_letter_0049">Capital I</string>
     <!-- Spoken description for Unicode code point U+0130: "İ" LATIN CAPITAL LETTER I WITH DOT ABOVE
          Note that depending on locale, the lower-case of this letter is U+0069 or U+0131. -->
     <string name="spoken_letter_0130">Capital I, dot above</string>
+    <!-- Spoken description for unknown emoji code point. -->
+    <string name="spoken_emoji_unknown">Unknown emoji</string>
 </resources>