[Web] Read default actions from Rspamd instead of using/printing "5,15"

[Web] Allow to reset spam score to server default (which deletes the custom spam score from the database and prints the default action values of Rspamd in use)

data/web/lang/lang.en.php

@@ -614,6 +614,7 @@ $lang['mailbox']['status'] = "Status";
 $lang['mailbox']['running'] = "Running";
 
 $lang['edit']['spam_score'] = "Set a custom spam score";
+$lang['user']['spam_score_reset'] = "Reset to server default";
 $lang['edit']['spam_policy'] = "Add or remove items to white-/blacklist";
 $lang['edit']['spam_alias'] = "Create or change time limited alias addresses";