i think, you dont understand correct - sorry

i talk only from the module
language edit, not about other wb-function like "minimum-chars in-username"
if you make a input , maybe to change a language variable like "$TEXT['USERNAME']", the script count the chars from your input and if your input has not a minimum from 11 chars (inclusive space, comma etc), the script stops
it has nothing to do with a login name, its only for the tool
language editfor example
you want to edit the language variable $TEXT['ADD'] -> the english text is "ADD", but the word "ADD" has only 3 chars, its too short for the script,
in you example you like to change the word LOGINNAME to
login nome == 10 chars, but not
more then 10 chars
if you change another word in the next lines, you have more then 10 chars and it works without error and error messages
thats my two solutions
1. change the code (see my first answer)
2. change more than one languages variables in the same time