Require bootstrap_styles:^2.0

Closes #3325151

added 4 commits

• 22117337...9012d817 - 2 commits from branch project:2.x
• 2e917e24 - Require bootstrap_styles:^2.0
• 77f572a5 - Merge branch '3325151-media-library-theme' of...

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added 4 commits

• 77f572a5...518838ca - 3 commits from branch project:2.x
• 73201c50 - Require bootstrap_styles:^2.0

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