Coupled the wordByWord attribute of PageState with TopMenuView

- We should now also filter for the selected filetype with wordByWord downloads.
Fixed filetype selection for wordByWord download feature.

- It appears that downloading of soundfiles currently doesn't work as intended.
Fixed wordByWord downloads

- Issue #5 requires .csv and .zip downloads to work in addition.
- This fix includes the commits 7472843 ebafb99 a94fb7e