Notices should allow to differ their content with respect to patron's gender. Especially slavic languages distinguish between variants for her/him having different suffixes for adjectives. One example:
"dear patron" (english)
"vážený čtenáři" (czech male variant)
"vážená čtenářko" (czech female variant)
this could be probably done with template toolkit, did you see bug 14757?
Ooops, this explains a lot! I'll give it a try and I'll throw away my local code changes developed up to now. Never mind.
Template toolkit mentioned by Josef perfectly solves this issue. Closing as INVALID issue.