When several languages (dictonaries, thesaurus, AutoCorrect) are installed and
used, then it seems that AutoCorrect does not open in the language of the active
document, but in the last language used. This is annoying because if formatted
text to add to AutoCorrect is selected in a documet and Auto Correct opens in
the wrong language with the "With" field filled in with the formatted text, and
then the language is changed to the correct language, the "WITH" field is
cleared and this the formatted text not available. Thus one has to start over.
And one can easily overlook that one has not added the AutoCorrect value to the
right language and then wonder why it is not working.

Set-up in my case : English, German and Frensh language packs installed.
Each time I create a new text document I go Tools/Options/Language
Settings/Languages and chose the correct "defaut language for documents" and
tick "For the current document only" (BTW this could be easier to access and the
chosen language setting could be shown in the status bar) . "Language of Locale
setting" is "Default".
I have tried to add an AutoCorrect value to the [All] language in the
AutoCorrect window, because I thought then I would be able to use it in all
languages, but OO crashed thouroughly. The AutoCorrect value I tried to add was
already existing in some of the installed language packs. Since then I haven't
touched the [All] language.