Re: Change 'real name' to 'display name' text
Assuming you are using en, edit the lang/en/language.php file and un comment the line with the text you want to change (there are several versions of "real name" but none of them have both words start with lower case letters as you specified) and then change the value assigned and save the file.
To change "Real name" find this line:
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// "Real name" => "Real name",
and change it to:
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"Real name" => "Display name",
Don't forget to clear cache after making the change.