locale.css breakes node editing forms

locale.css contains the following strange CSS code:

.form-item-language,
.form-item-translation,
.form-item-group {
  float: left; /* LTR */
  padding-right: .8em; /* LTR */
  margin: 0.1em;
  /**
   * In Opera 9, DOM elements with the property of "overflow: auto"
   * will partially hide its contents with unnecessary scrollbars when
   * its immediate child is floated without an explicit width set.
   */
  width: 15em;
}

and .form-item-group here is just weird imho.

This code if loaded (by locale_block_view()) makes form fields of language selection to float left, which in its turn, breaks the form visually. See the screenshot.