override emoji search filed hint text to be translatable

Resolves #2110

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

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

@@ -20,7 +20,7 @@
   ~ along with this program.  If not, see <http://www.gnu.org/licenses/>.
   -->
 
-<resources>
+<resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Common -->
     <string name="nc_yes">Yes</string>
     <string name="nc_no">No</string>
@@ -328,6 +328,9 @@
     <string name="nc_message_failed_to_send">Failed to send message:</string>
     <string name="nc_remote_audio_off">Remote audio off</string>
     <string name="nc_add_attachment">Add attachment</string>
+    <string name="emoji_category_recent" tools:ignore="PrivateResource">Recent</string>
+    <string name="emoji_backspace" tools:ignore="PrivateResource">Backspace</string>
+    <string name="emoji_search" tools:ignore="PrivateResource">Search emoji</string>
 
     <!-- Content descriptions -->
     <string name="nc_description_send_message_button">Send message</string>