SAW - Bootstrap 4 Forms Styling Fixes

[SamWord]

Changed the styling according to comments on #166643537

• Table sizing is now auto since col sizing doesn't work on tables in Chrome. Auto sizing also looks nicer in general.
• Buttons stay in a horizontal line in Chrome.
• Added word break to saved response filters in case a user makes a response filter with a really long name.
• The export button on the responses table was broken so I fixed it to properly export .xlsx files.
• While I was fixing the export bug, I found that one of the surveys had a "/" in the name, causing another bug where an excel sheet name was invalid. Regex used to match characters based off of this: https://stackoverflow.com/questions/451452/valid-characters-for-excel-sheet-names