After looking around a bit I couldn't find any clear instructions on how to install dictionaries for the spell checker in the Falkon browser so I have included my method below.
QtWebEngine comes with a converter to change dictionaries to the .bdic format used by the chromium browser as documented on the kde userbase wiki https://userbase.kde.org/index.php?title=Falkon#Spell_Check but you can avoid this by downloading .bdic format for chromium directly.

download the chromium dictionaries from google

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git clone https://chromium.googlesource.com/chromium/deps/hunspell_dictionaries

dictionaries need to be moved to a directory for falkon to use them, create the directory for falkon to use

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sudo mkdir /usr/share/qt5/qtwebengine_dictionaries

cd to where dictionaries were downloaded in your home directory, probably something like

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cd /home/hunspell_dictionaries/


copy the dictionaries you want to install to the directory, in my case I chose German and British English. Make sure you choose a .bdic file

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sudo cp de-DE-3-0.bdic en-GB-9-0.bdic /usr/share/qt5/qtwebengine_dictionaries/


In Falkon under Peferences - spell check - the dictionaries should now be visible.

hope someone finds this useful.

Thanks for this. I wish this was more straightforward. I couldn't find this anywhere.