Refactoring api to use translations (chunk 1)

- Add spanish translations
- Files in order by name from admin to export
- Does not include api templates and tests
- Fix web_test to load translations
- Fix i18n to fallback to DEFAULT_LOCALE if no system locale found

utils/i18n.go

@@ -36,7 +36,10 @@ func InitTranslations() {
 func GetTranslationsBySystemLocale() i18n.TranslateFunc {
 	locale := model.DEFAULT_LOCALE
 	if userLanguage, err := jibber_jabber.DetectLanguage(); err == nil {
-		locale = userLanguage
+		// only set the system locale if is supported, fallback to DEFAULT_LOCALE
+		if contains(userLanguage) {
+			locale = userLanguage
+		}
 	}
 
 	if locales[locale] == "" {
@@ -138,3 +141,12 @@ func getTranslationsAndLocale(w http.ResponseWriter, r *http.Request) (i18n.Tran
 	SetLocaleCookie(w, model.DEFAULT_LOCALE, 10)
 	return translations, model.DEFAULT_LOCALE
 }
+
+func contains(l string) bool {
+	for _, a := range locales {
+		if a == l {
+			return true
+		}
+	}
+	return false
+}