clean up the resources

This commit removes all files or entries not used in the resources.

Change-Id: I2f9eb86520e3e7dc50d148fe9e926f157fa8cd41
Reviewed-by: Hadrien De Sousa <hadrien.desousa@savoirfairelinux.com>
diff --git a/ring-android/app/src/main/res/values-ca/strings_call.xml b/ring-android/app/src/main/res/values-ca/strings_call.xml
index a8ae3f6..15b8960 100644
--- a/ring-android/app/src/main/res/values-ca/strings_call.xml
+++ b/ring-android/app/src/main/res/values-ca/strings_call.xml
@@ -22,5 +22,4 @@
 -->
 <resources>
     <string name="call_human_state_hold">En espera</string>
-    <string name="conference_human_state_hold">En espera</string>
-    </resources>
\ No newline at end of file
+</resources>
\ No newline at end of file