PROBLEM

I can't change the CAPTCHA label, which is "Please enter the following,  Help us prevent SPAM!"

 

SOLUTION

 
Make sure, under Basic Options, that you have selected your preferred language.
 
If you need further translation, open the appropriate language file in the folder /path/to/joomla/modules/mod_simpleemailform/language_files/xx_XX.mod_simpleemailform.ini

 

 

Look for these two lines:

 

MOD_SIMPLEEMAILFORM_captcha_please_enter     = "Please enter the following"
MOD_SIMPLEEMAILFORM_captcha_please_help     = "Help us prevent SPAM!"

And make the changes in "quotes"