Bump for release 2.8.0

[isacoder]

Description

Features

• UtilityHeader: Developers can now set custom labels for the back and share buttons.
  The following props have been removed and need to be replaced:

  • backLink
  • showShareLink
  • shareLink

  These have been replaced with two new object props: back and share, as detailed below:

  Back button configuration:
  Replace backLink with the back object:

   back = {  
    link: '/example',   // Replaces backLink  
    label: 'Back'       // Optional, useful for localization overrides  
   }

  Share button configuration:
  Replace `shareLink` with the `share` object:

share = {  
  link: true,              // Replaces shareLink  
  label: 'Share'           // Optional, useful for localization overrides  
  copiedLabel: 'Copied.'   // Shown after clicking, optional for localization overrides  
}

For more details, see the PR #530.

• Icons
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