Evas language: Fix language from locale function.

This function was trying to infer from the LANG env var, though it should
have just queried the locale all along, as the language we want is the
system's text language, and not necessarily the LANG variable's value.

@fix.

src/lib/evas/common/language/evas_language_utils.c

@@ -21,6 +21,7 @@
 #endif
 
 #include <stdlib.h>
+#include <locale.h>
 
 #include <Eina.h>
 
@@ -134,7 +135,7 @@ evas_common_language_from_locale_get(void)
    if (*lang) return lang;
 
    const char *locale;
-   locale = getenv("LANG");
+   locale = setlocale(LC_MESSAGES, NULL);
    if (locale && *locale)
      {
         char *itr;