Add gender in memorial messages

Ready for merge.

This PR add gender based messages in memorial. It doesn't touch English language but applies to translations. In memorial messages in English we need not specify gender but translations need it.
 I was looking for simple way to realize that and i think i have found it.
I have rewrited add_memorial_log() function with 2 format strings. Each string have own gettext context. So, if player is male in memorial it will be written gettext string with "memorial_male" context. And if player is female, in memorial it will be written gettext string with "memorial_female" context. This is the simplest way to do that.

Tested. Worked. Linux.

Open for suggestion.