[epiphany] gnome-languages: fix crashes on unexpected locales

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 471c536bafd8e8f24de76d369bfe5b8d6c67272e
Author: Michael Catanzaro <mcatanzaro posteo net>
Date:   Thu Mar 7 16:30:32 2019 +0000

    gnome-languages: fix crashes on unexpected locales
    
    I forgot to error-check the result of newlocale to make sure it's really
    a valid locale.

 lib/contrib/gnome-languages.c | 4 ++++
 src/prefs-dialog.c            | 2 ++
 2 files changed, 6 insertions(+)
---
diff --git a/lib/contrib/gnome-languages.c b/lib/contrib/gnome-languages.c
index b754229e6..d663c1507 100644
--- a/lib/contrib/gnome-languages.c
+++ b/lib/contrib/gnome-languages.c
@@ -710,6 +710,8 @@ get_translated_language (const char *code,
 
                 if (locale != NULL) {
                         loc = newlocale (LC_MESSAGES_MASK, locale, (locale_t) 0);
+                        if (loc == (locale_t) 0)
+                                return NULL;
                         old_locale = uselocale (loc);
                 }
 
@@ -767,6 +769,8 @@ get_translated_territory (const char *code,
 
                 if (locale != NULL) {
                         loc = newlocale (LC_MESSAGES_MASK, locale, (locale_t) 0);
+                        if (loc == (locale_t) 0)
+                                return NULL;
                         old_locale = uselocale (loc);
                 }
 
diff --git a/src/prefs-dialog.c b/src/prefs-dialog.c
index 9ef2e5515..bd36daccb 100644
--- a/src/prefs-dialog.c
+++ b/src/prefs-dialog.c
@@ -1600,6 +1600,8 @@ create_language_section (PrefsDialog *dialog)
       g_autofree char *normalized_locale = normalize_locale (code);
       if (normalized_locale != NULL) {
         g_autofree char *language_name = language_for_locale (normalized_locale);
+        if (language_name == NULL)
+            language_name = g_strdup (normalized_locale);
         language_editor_add (dialog, normalized_locale, language_name);
       }
     }