I'll try to explain them and hope that it makes sense enough for you to be able to translate.
$helptxt['badbehavior_postcount_wl'] = 'This allows you to bypass bad behavior checks for users over a certain post count.<br />-1 will bypass all registered users, including those with no posts<br />0 will disable bypassing and scan everyone regardless of post count<br />Any number greater than zero sets the post count under which users will be checked.';
This allows you fine tune what connections are checked by Bad Behavior.
-1 = Never perform BB checks if they are registered members. (maybe OK on a closed board, admin approved registration)
0 = Everyone gets scanned, trust no one
X = Everyone below X post count gets scanned. (So after someone has made enough posts, you can trust they are not a spammer)
$helptxt['badbehavior_url_wl'] = 'URLs are matched from the first / after the server name up to, but not including, the ? (if any). The URL to be whitelisted is a URL on YOUR site. A partial URL match is permitted, so URL whitelist entries should be as specific as possible, but no more specific than necessary.<br />For instance, /example would match /example.php and /example/address';
Thats a lot of words to kind of say its a wildcard value. The area that it will match against is anything after the server name up to the ? get request. So for example ://www.something.com
/forum/downhere/subscriptions.php?sendmemoney its matching the underlined area against what you enter.
Example.
entering /forum/downhere/subscriptions.php is very specific, it is a single file
entering just /downhere would white-list the entire downhere area, so if there were several files in that area that you want BB to whitelist, entering that is a lot easier than adding an entry for every single file in the downhere area.
If the clarifications are useful, they can be added to transifex as well, each entry can have comments and or images to help translate things. O:-)