I am using OJS version 22.214.171.124 and I want the CitationStyleLanguage plugin to let me capitalize only words that have more than three letters.
For example, in the previous image you can see how a single letter is also capitalized and we don’t want it to be displayed that way
I think this is rather a problem of the CSL definition of the specific citation style.
In the CSL specification, there is nothing such as a title case conversion rule for words that have more than three letters, however language is influencing how words are capitalized. So you need to pass the language with the journal title to the CSL interpreter. See here: https://docs.citationstyles.org/en/stable/specification.html#title-case-conversion