Index: wp-admin/css/install.dev.css
===================================================================
--- wp-admin/css/install.dev.css	(revision 18817)
+++ wp-admin/css/install.dev.css	(working copy)
@@ -251,3 +251,15 @@
 	direction: ltr;
 }
 
+.rtl .form-fields .field-input {
+	margin-left: 0;
+	margin-right: 150px;
+}
+
+.rtl .form-fields .field-full {
+	margin-right: 0;
+}
+
+.rtl .form-fields .field-label {
+	float: right;
+}