I know what you mean
If the ad is selected as I stated where ever if your viewing an ad thats in a personals category then the word home should turn to personals.
Overwriting base wording is done as posted in my last post your languages/english subdirectory you have script files which override default wording by loading a secondary language file
You will find the phrase you want to change in the languages/english/showproduct2.php file. The wording used is based on the ad type you select to assign to a category. Did you mean to setup that category as a Personals Template Type?