Titles Listing - Column Browser + other GUI changes

- Change the dropdown filters into "column browser".
- Use only one form for all filtering
- Removed accordeon for multiple subscriptions in table
- Display subscription name instead of 'Subscription Link'
- Renamed 'Issue Entitlement Link' to 'Full details'
- Change from 'Subscription(s) Valid On' to 'Subscription Valid On'
- Change filter label to 'Search text' and add placeholder "enter search term..."
Merge branch 'newdev' into edina
Title listing - Quick Fix

Didn't realise the subscription name was display twice.
Titles listing - Quick Fix

Fixing the Other Platform browse column which wasn't displaying the current filter.
Merge branch 'newdev' into edina