set title width to fill available area and truncate any additional text

[werner33]

In this commit the following changes are made:

• Eliminated an unused selector in css .preview__title
• Added a selector .preview__title-text
• Added rules to limit title text to no more than 100% width minus 75px for the three icons in the same row
• Truncated the title when there is not enough room to display the full text

Note: the title is still centered as the parent element has text-align:center;