Allow selection of multiple words at once when filtering by word

[mishaschwartz]

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[mishaschwartz]

Currently sort by word is implemented using a drop down list. This only allows the user to choose a single word at a time. Instead this should open a dialog box allowing the user to choose multiple words.
We could also add a search feature within this dialog box and other filtering options.

If we put all filtering options in this dialog box, the filter panel could even just be a single toggle button and an option to open the dialog box. Yeah lets do that, I like that.