There is a problem with wiki syntax rendering in Lithuanian Wikipedia.

For example, the source code [[Charizma]]tiškas žmogus (=charismatic person; no space after square brackets) renders as Charizmatiškas žmogus. The text in bold is a internal link to the article "Charizma" but the rest of word "Charizmatiškas", starting with Lithuanian letter "š", is a regular text.

Here is a link to a sandbox where more examples with comments are shown: https://test2.wikipedia.org/w/index.php?title=User:Durininkas/sandbox&oldid=288444
As the examples show, on different wikis foreign language's letters are treated as other (=non-native-lowercase-letter && non-Latin-lowercase-letter) characters, which are never attached to wikilinks after square brackets, so Lithuanian letters (see below) are needed to be "added" to the alphabet (locally).

How should it be? [[Article in Lithuanian Wikipedia]]ąčęėįšųūž → Article in Lithuanian Wikipediaąčęėįšųūž (whole text in bold is an internal link directing to the article named "Article in Lithuanian Wikipedia");
[[Charizma]]tiškas žmogus → Charizmatiškas žmogus; etc.

Why is this feature needed? It makes source code readable more easily.

Lithuanian lowercase letters:
ą, č, ę, ė, į, š, ų, ū, ž.