/say don't use <pseudonym>

What is "pseudo" referring to?

I'm assuming 'pseudo' here is the player name (pseudonym)? Maybe lost in translation... ?

Nonetheless, this is always how chat and /say, respectively, have worked.  The format for chat has always been <%1$s> %2$s, and the format for /say has always been  [%1$s] %2$s.

Yes pseudo is for pseudonym, sorry I'm French 

In fact in the translation files there is (since ever):
chat.type.text = <%s> %s
chat.type.announcement = [%s] %s
So, this is not a bug.

Ok