Synced bcompat tree additions and fixes found so far

plugins/include/lang.inc

@@ -23,4 +23,14 @@ native get_lang(id, name[3]);
 native register_dictionary(const filename[]);
 
 //returns 1 if the language is loaded, 0 otherwise.
-native lang_exists(const name[]);
+native lang_exists(const name[]);
+
+/**
+ * Adds or finds a translation key.
+ */
+native TransKey:CreateLangKey(const key[]);
+
+/**
+ * Adds a translation.
+ */
+native AddTranslation(const lang[3], TransKey:key, const phrase[]);