Unbreak translations

Signed-off-by: Joas Schilling <coding@schilljs.com>

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

@@ -390,7 +390,7 @@
     <string name="nc_voice_message_filename">Talk recording from %1$s (%2$s)</string>
     <string name="nc_voice_message_hold_to_record_info">Hold to record, release to send.</string>
     <string name="nc_description_record_voice">Record voice message</string>
-    <string name="nc_voice_message_slide_to_cancel">&lt;&lt; Slide to cancel</string>
+    <string name="nc_voice_message_slide_to_cancel">« Slide to cancel</string>
     <string name="play_pause_voice_message">Play/pause voice message</string>
     <string name="nc_voice_message_missing_audio_permission">Permission for audio recording is required</string>