preference_editor.xml: "Key phrases" description improved.

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

@@ -75,6 +75,6 @@
     <string name="chats_attention_sound">Attention sound\nChoose ringtone</string>
     <string name="connection_load_vcard">Load vCard\nLoad and update contact\'s personal info and avatar. Disable to reduce traffic usage.</string>
     <string name="connection_use_carbons">Carbon-copied mode\nMay be unstable! Will share sessions for the same account on this client. Disable to reduce traffic usage.</string>
-    <string name="events_phrases">Key phrases\nNotify some messages that contain preset phrases and select the sounds</string>
+    <string name="events_phrases">Key phrases\nCreate custom notifications for received messages that contain specific phrases</string>
     <string name="security_clear_certificate_warning">Do you really want to remove all ignored certificates?</string>
 </resources>