TeXstudio asks for 'it_IT' but only 'it' available

I’m calling LT server from TeXstudio with my file language set to it_IT. But LT server complains:
java.lang.IllegalArgumentException: ‘it-IT’ is not a language code known to LanguageTool.
I’m running LanguageTool 3.1 (build date: 2015-09-28 10:14 on Win 7 64bits.
Any simple solution to map it to ‘it_IT’?
Thanks for your help!
mario

I’m not sure, this is something the TeXstudio developers can better comment on. I think LanguageTool’s behavior hasn’t changed recently when it comes to language codes.

This command indicates which languages are supported by LanguageTool:

$ java -jar LanguageTool-3.1/languagetool-commandline.jar --list
ast-ES Asturian
be-BY Belarusian
br-FR Breton
ca Catalan
ca-ES Catalan
ca-ES-valencia Catalan (Valencian)
da-DK Danish
de German
de-AT German (Austria)
de-CH German (Swiss)
de-DE German (Germany)
de-DE-x-simple-language Simple German
el-GR Greek
en English
en-AU English (Australian)
en-CA English (Canadian)
en-GB English (GB)
en-NZ English (New Zealand)
en-US English (US)
en-ZA English (South African)
eo Esperanto
es Spanish
fa Persian
fr French
gl-ES Galician
is-IS Icelandic
it Italian
ja-JP Japanese
km-KH Khmer
lt-LT Lithuanian
ml-IN Malayalam
nl Dutch
pl-PL Polish
pt Portuguese
pt-BR Portuguese (Brazil)
pt-PT Portuguese (Portugal)
ro-RO Romanian
ru-RU Russian
sk-SK Slovak
sl-SI Slovenian
sv Swedish
ta-IN Tamil
tl-PH Tagalog
uk-UA Ukrainian
zh-CN Chinese

I suppose that TexStudio developers wrongly assumed that all languages were like in English (en-US, en-CA, etc.).