So I am not going to use menu on web direct.
This is not help for OP, but the help is not correct in detail, says "For Status Area Language, select the language that FileMaker WebDirect will use if the language on the client’s operating system is not supported." but the language on the clients is defined in setteing of browser.
My OS is Japanese, but if i set brower language order as "Deutsch / Turkish / Japanese / English", Webd use Deutsch if it is set as English.
Unfortunately, My OP and My Browser is in Turkish Language but result is English (FM Server 16)
Yes, there is not "Turkish" in the list of selection on Webd setting. If you are better on Deutsch or French or any other language in the list than English, you can set it on server side, but not Turkish.
This is not supported, but you'd find menu strings in
C:\Program Files\FileMaker\FileMaker Server\Web Publishing\publishing-engine\jwpc-tomcat\fmi\VAADIN\themes\default\i18n\ja\strings.properties
(using Windows for server, ja means japanese)
so translate it to Turkish from any language which you don't need, then set it in webd default language.
(I tested changing only one word for "Sign out" and it worked after restarting server.)