Here are GNU sed commands for typo fixes for the .tcl files.

sed -i "s/dialogs/dialogues/g" bwidget/utils.tcl
sed -i "s/existance/existence/g" bwidget/entry.tcl
sed -i "s/informations/information/g" bwidget/listbox.tcl
sed -i "s/perferct/perfect/g" bwidget/widget.tcl
sed -i "s/substract/subtract/g" bwidget/notebook.tcl

If it's desired to edit the ChangeLog here are the fixes.

sed -i "s/Disfunction/Dysfunction/g" bwidget/ChangeLog
sed -i "s/appearence/appearance/g" bwidget/ChangeLog
sed -i "s/dialogs/dialogues/g" bwidget/ChangeLog
sed -i "s/enless/endless/g" bwidget/ChangeLog
sed -i "s/horizantal/horizontal/g" bwidget/ChangeLog
sed -i "s/incompatabilities/incompatibilities/g" bwidget/ChangeLog
sed -i "s/paramters/parameters/g" bwidget/ChangeLog
sed -i "s/reagion/region/g" bwidget/ChangeLog

If it's desired to edit CHANGES.txt.

Perhaps displacement rather than deplacement (not an English word) was the intention here.

If that's not appropriate then possibly replace 'the deplacement' with 'shifting'

$ sed -n '708,710p' bwidget/dynhelp.tcl
        # Increment the required size by the deplacement from the passed point
        incr width 8
        incr height 12
$

Is unknown-time rather than unknow-time the intention here?

$ sed -n '164p' bwidget/CHANGES.txt
    - now can be incremental or not limited ('unknow-time' processing)
$ 

If unknown is correct then this would be the fix.

sed -i "s/unknow/unknown/g" bwidget/CHANGES.txt

Here are other typos in CHANGES.txt.

sed -i "s/completly/completely/g" bwidget/CHANGES.txt
sed -i "s/incompatibilites/incompatibilities/g" bwidget/CHANGES.txt
sed -i "s/optionnal/optional/g" bwidget/CHANGES.txt
sed -i "s/painfull/painful/g" bwidget/CHANGES.txt
sed -i "s/retreive/retrieve/g" bwidget/CHANGES.txt