If you go through qa-config.php file, you will find an example for what you are looking. See below
$QA_CONST_PATH_MAP=array(
'questions' => 'topics', // change topics with your text to change questions title in url
'categories' => 'sections', // change sections to your text to display instead of categories
'users' => 'contributors', // etc....
'user' => 'contributor', // etc....
);
Find above code in qa-config.php and add yours there and done..
Update
You should add and modify code same as below
/*
If you wish, you can define an array $QA_CONST_PATH_MAP to modify the URLs used in your Q2A site.
The key of each array element should be the standard part of the path, e.g. 'questions',
and the value should be the replacement for that standard part, e.g. 'topics'. If you edit this
file in UTF-8 encoding you can also use non-ASCII characters in these URLs.
$QA_CONST_PATH_MAP=array(
'questions' => 'topics',
'categories' => 'sections',
'users' => 'contributors',
'user' => 'contributor',
);
*/
$QA_CONST_PATH_MAP=array(
'questions' => 'topics', // change topics with your text
'categories' => 'sections', // change sections with your text
'users' => 'contributors', // etc..
'user' => 'contributor', // etc...
);
