2.1 Identifying changes in
language

• 4.1 Clearly identify changes in the natural language of a
  document's text and any text equivalents (e.g., captions).
  [Priority 1]

<P>And with a certain <SPAN lang="fr">je ne sais quoi</SPAN>, 
   she entered both the room, and his life, forever. <Q>My name
   is Natasha,</Q> she said. <Q lang="it">Piacere,</Q>
   he replied in impeccable Italian, locking the door.

1. Users who are reading the document in braille will be able to substitute
   the appropriate control codes (markup) where language changes occur to ensure
   that the braille translation software will generate the correct characters
   (accented characters, for instance). These control codes also prevent braille
   contractions from being generated, which could further confuse the user.
   Braille contractions combine commonly used groups of characters that usually
   appear in multiple cells into a single cell. For example, "ing" which usually
   takes up three cells (one for each character) can be contracted into a single
   cell.
2. Similarly, speech synthesizers that "speak" multiple languages will be able
   to generate the text in the appropriate accent with proper pronunciation. If
   changes are not marked, the synthesizer will try its best to speak the words in
   the primary language it works in. Thus, the French word for car, "voiture" would be pronounced "voter" by a speech synthesizer
   that uses English as its primary language.
3. Users who are unable to translate between languages themselves, will be
   able to have unfamiliar languages translated by machine translators.