UI/UX optimization, Microsoft AD labeling

• The search in trend & signal result lists now works as a keyword search ("or") instead of a text search ("and"), based on title, description and tags.
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• The trend and idea list view now shows images.

• We support different user pools: Automatically synchronized and manually added users. Synchronized and automatically updated users benefit from a SingleSignOn (SSO) and are now identified by a cloud icon in the user entry.

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