Steps to reproduce the issue

I remarked these strings in installation/language/en-GB/en-GB.ini

; Field password messages
JFIELD_PASSWORD_INDICATE_INCOMPLETE="Password doesn't meet site's requirements"
JFIELD_PASSWORD_INDICATE_COMPLETE="Password accepted"
JFIELD_PASSWORD_NOTE_LBL="Password must contain:"
JFIELD_PASSWORD_NOTE_DESC="%1 symbol(s), %2 uppercase letter(s), %3 lowercase letter(s), %4 number(s)"

If anyone who added these strings intends to use them, I would be curious about the way that person intended to code as obviously the variables can't be set by the person installing Joomla.

Maybe the variable would get hardcoded default values (which could be overriden by custom distros in installation/localise.xml) ? Strings anyway would have to be modified.

If it is just one of these mistakes (it happens), I rather suggest to add a note asking the SuperUser to set the rules and modify her/his password once J is installed.

or just delete these strings.