add Slovenian to the list of compiled languages

src/slovenian/AllSlv.gf

@@ -0,0 +1,5 @@
+--# -path=.:../abstract:../common:../prelude
+
+concrete AllSlv of AllSlvAbs = 
+  LangSlv
+  ** {} ;

src/slovenian/AllSlvAbs.gf

@@ -0,0 +1,5 @@
+--# -path=.:../abstract:../common:prelude
+
+abstract AllSlvAbs = 
+  Lang
+  ** {} ;