If your language doesn't have a specific level userbox and you don't want to create it yourself, you can use a generic programming language userbox. Pages with these templates show the specified language skill, and belong to the corresponding
general programming skill category:
Note that e.g. {{User programming-!3|Fortran}} won't add you to Category:User for-3, but you can add existing categories manually to the end of your page:
[[Category:User for-3|{{PAGENAME}}]]
On a user page the {{PAGENAME}} is simply the user name, used as sort key for the category,
otherwise the entry would be sorted under U = User.