Fixes JOINDIN-377 - removes word 'View' from talk(s), track(s) and comment(s) buttons in Event detail page

This PR removes the word "View" from src/res/values/strings.xml as follows:

generalEvent<$item>Singular (String), and 
generalEvent<$item>Plural (String) 

....where $item = Track/s, Talk/s and Comment/s

I also fixed where one occurence where $item was appearing as plural where it should have been singular.  

I wasn't able to 'Run' the application to test it as there were 5 errors in the Problems view (to do with build issues) that I didn't understand and couldn't debug (yet).  I hope this fixes the issue though.