Translation: Lubomir Grajciar translated the H2 Console as well as all error…

Translation: Lubomir Grajciar translated the H2 Console as well as all error message to Slovensky. Thanks a lot!

h2/src/main/org/h2/server/web/WebServer.java

@@ -61,6 +61,7 @@ public class WebServer implements Service {
         { "pt_BR", "Portugu\u00eas (Brasil)"},
         { "pt_PT", "Portugu\u00eas (Europeu)"},
         { "ru", "\u0440\u0443\u0441\u0441\u043a\u0438\u0439"},
+        { "sk", "Slovensky"},
         { "tr", "T\u00fcrk\u00e7e"},
         { "uk", "\u0423\u043A\u0440\u0430\u0457\u043D\u0441\u044C\u043A\u0430"},
         { "zh_CN", "\u4e2d\u6587 (\u7b80\u4f53)"},