Fix gcc header-inline linker error

Author: Nopey

src/resources/languages.h

@@ -25,9 +25,8 @@ enum
 
 // Gets an openomf localization string
 const char *lang_get(unsigned int id);
-inline const char *lang_get2(unsigned int id) {
-    return lang_get(id);
-}
+// Gets an openomf localization string
+#define lang_get2(id) lang_get(id)
 
 // Gets an openomf localization string (from one of the tables)
 #define lang_get_offset(LANG2_STR, offset) lang_get_offset_impl(LANG2_STR, LANG2_STR##_COUNT, (offset))