speakup: Add documentation on changing the speakup messages language

This documents how to use speakup_setlocale to set the speakup messages
language.

Signed-off-by: Samuel Thibault <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/admin-guide/spkguide.txt

···
 The speakup key is depressed, so the name of the key state is speakup.
 This part of the message comes from the states collection.
 
-14.2.  Loading Your Own Messages
+14.2.  Changing language
+
+14.2.1. Loading Your Own Messages
 
 The files under the i18n subdirectory all follow the same format.
 They consist of lines, with one message per line.
···
 The next time that Speakup says message 1 from the colors group, it will
 say "azul", rather than "blue."
 
+14.2.2. Choose a language
+
 In the future, translations into various languages will be made available,
-and most users will just load the files necessary for their language.
+and most users will just load the files necessary for their language. So far,
+only French language is available beyond native Canadian English language.
+
+French is only available after you are logged in.
+
+Canadian English is the default language. To toggle another language,
+download the source of Speakup and untar it in your home directory. The
+following command should let you do this:
+
+tar xvjf speakup-<version>.tar.bz2
+
+where <version> is the version number of the application.
+
+Next, change to the newly created directory, then into the tools/ directory, and
+run the script speakup_setlocale. You are asked the language that you want to
+use. Type the number associated to your language (e.g. fr for French) then press
+Enter. Needed files are copied in the i18n directory.
+
+Note: the speakupconf must be installed on your system so that settings are saved.
+Otherwise, you will have an error: your language will be loaded but you will
+have to run the script again every time Speakup restarts.
+See section 16.1. for information about speakupconf.
+
+You will have to repeat these steps for any change of locale, i.e. if you wish
+change the speakup's language or charset (iso-8859-15 ou UTF-8).
+
+If you wish store the settings, note that at your next login, you will need to
+do:
+
+speakup load
+
+Alternatively, you can add the above line to your file
+~/.bashrc or ~/.bash_profile.
+
+If your system administrator ran himself the script, all the users will be able
+to change from English to the language choosed by root and do directly
+speakupconf load (or add this to the ~/.bashrc or
+~/.bash_profile file). If there are several languages to handle, the
+administrator (or every user) will have to run the first steps until speakupconf
+save, choosing the appropriate language, in every user's home directory. Every
+user will then be able to do speakupconf load, Speakup will load his own settings.
 
 14.3.  No Support for Non-Western-European Languages