Minor enhancement to Sign Up Password plugin to assist customisation

When customising a signup page that has the Sign Up Password plugin, there is a very minor tweak that will assist customisation.

Currently the plugin sensibile has translation support, but unfortunately has hard coded the brackets around a couple of messages.
Moving these brackets inside the _e() on lines 389 and 395 will enable customisation of the language including whether or not / which style of brackets are used via the language file rather than resorting to changing plugin code.

---- I managed to get this in the wrong section - change you move it to features & feedback please ?----

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