Merge pull request #847 from Cosmius/patch-1

lazy import helpers to prevent circular imports

flask_admin/babel.py

 try:
-    from .helpers import get_current_view
-
     from flask_babelex import Domain
 
+except ImportError:
+    def gettext(string, **variables):
+        return string % variables
+
+    def ngettext(singular, plural, num, **variables):
+        return (singular if num == 1 else plural) % variables
+
+    def lazy_gettext(string, **variables):
+        return gettext(string, **variables)
+
+else:
     from flask_admin import translations
 
     class CustomDomain(Domain):
@@ -24,12 +33,6 @@ try:
     gettext = domain.gettext
     ngettext = domain.ngettext
     lazy_gettext = domain.lazy_gettext
-except ImportError:
-    def gettext(string, **variables):
-        return string % variables
 
-    def ngettext(singular, plural, num, **variables):
-        return (singular if num == 1 else plural) % variables
-
-    def lazy_gettext(string, **variables):
-        return gettext(string, **variables)
+# lazy imports
+from .helpers import get_current_view