it is not quite that simple. first, that line of text is different depending on whether the viewer is logged in or not.
also, if you make this change in the template file then you have to remember to do it again every time you update phpbb.
or, you have to create a custom style just for this one little change.
I would suggest that you don't bother, nobody but you will care about this or even know that you made this change.
I'm baaaaaccckkkk. still doing work on donation basis. PM your needs.
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If nobody is in the forest, does a tree really fall?