Fix Toast texts

src/main/java/com/owncloud/android/media/MediaService.java

@@ -472,7 +472,7 @@ public class MediaService extends Service implements OnCompletionListener, OnPre
 
         } catch (SecurityException | IOException | IllegalStateException | IllegalArgumentException e) {
             Log_OC.e(TAG, e.getClass().getSimpleName() + " playing " + mAccount.name + mFile.getRemotePath(), e);
-            Toast.makeText(this, String.format(getString(R.string.media_err_security_ex), mFile.getFileName()),
+            Toast.makeText(this, String.format(getString(R.string.media_err_unexpected), mFile.getFileName()),
                     Toast.LENGTH_LONG).show();
             processStopRequest(true);
         }

src/main/res/values/strings.xml

@@ -231,8 +231,6 @@
     <string name="media_err_timeout">Attempt to play file timed out</string>
     <string name="media_err_invalid_progressive_playback">The media file can not be streamed</string>
     <string name="media_err_unknown">The built-in media player is unable to play the media file</string>
-    <string name="media_err_security_ex">A security error was encountered trying to play %1$s</string>
-    <string name="media_err_io_ex">Input error while trying to play %1$s</string>
     <string name="media_err_unexpected">Unexpected error while trying to play %1$s</string>
     <string name="media_rewind_description">Rewind button</string>
     <string name="media_play_pause_description">Play or pause button</string>