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-bg/strings_call.xml b/ring-android/app/src/main/res/values-bg/strings_call.xml
index 71bd86b..90eaa59 100644
--- a/ring-android/app/src/main/res/values-bg/strings_call.xml
+++ b/ring-android/app/src/main/res/values-bg/strings_call.xml
@@ -32,5 +32,4 @@
     <string name="call_human_state_hold">Задържане</string>
     <string name="call_human_state_unhold">Подновяване</string>
     <string name="call_human_state_over">Край</string>
-    <string name="conference_human_state_hold">Задържане</string>
-    </resources>
\ No newline at end of file
+</resources>
\ No newline at end of file