Enhance wording on login page

Changed after some user confusion in forum
https://www.mantisbt.org/forums/viewtopic.php?f=3&t=24522

lang/strings_english.txt

@@ -668,7 +668,7 @@ $s_error_code_version_out_of_date = '<strong>Warning:</strong> The database stru
 # login_page.php
 $s_login_page_info = 'Welcome to the Issue Tracker.';
 $s_login_title = 'Login';
-$s_save_login = 'Remember my login in this browser';
+$s_save_login = 'Keep me logged in';
 $s_secure_session = 'Secure Session';
 $s_secure_session_long = 'Only allow your session to be used from this IP address.';
 $s_choose_project = 'Choose Project';