In em-folder-properties.c, the following code is problematic:

if (info->name && quota->next)
	descr = g_strdup_printf ("%s (%s):", _("Quota usage"), _(info->name));
else
	descr = g_strdup_printf ("%s:", _("Quota usage"));

What about RTL languages? What about languages who put a space before ":"?

Even if this means one more string to translate, you have no other choices than:

if (info->name && quota->next)
	descr = g_strdup_printf (_("Quota usage (%s):"), _(info->name));
else
	descr = g_strdup_printf (_("Quota usage:"));