add an internationalization constant

gather all ENGLISH|GERMAN|CHINESE etc preprocessor hell into a single
library, so to restrict the number of targets that need to be built 8x

this still has UB/EDITOR definitions so that still needs to be dealt
with before we can build it only 8 times

i18n/language.cpp

@@ -0,0 +1,24 @@
+#include <language.hpp>
+
+/* FIXME: The ugliest of ugly hacks. Getting rid of this and letting language
+ * (ideally text and voice separately) be set in the options menu would be
+ * ideal. */
+const i18n::Lang g_lang{
+  #if defined(ENGLISH)
+  i18n::Lang::en
+#elif defined(CHINESE)
+  i18n::Lang::zh
+#elif defined(DUTCH)
+  i18n::Lang::nl
+#elif defined(FRENCH)
+  i18n::Lang::fr
+#elif defined(GERMAN)
+  i18n::Lang::de
+#elif defined(ITALIAN)
+  i18n::Lang::it
+#elif defined(POLISH)
+  i18n::Lang::pl
+#elif defined(RUSSIAN)
+  i18n::Lang::ru
+#endif
+};