I have tested that condition, and found that it is a display bug only haunting the English language client - or at least not a client with language set to German or French (Russian and Spanish speakers kindly check). In the German language setting, I find the "Aufpasser", in the French one the "Veilleurs", but not the Watchers in the English one. On the other hand, the English client has the most nicely sorted tribe list ;)
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Daomei die Streunerin - religionsneutral, zivilisationsneutral, gildenneutral