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This commit adds support for empty string as a valid topic name in syntax for linking to channel messages. The server stores it after empty string is replaced with `realm_empty_topic_display_name` and wrapped with an <em> tag. The web client parses the rendered_content and updates the topic_name part in the HTML with topic_name in user's language + wraps it in a <span> tag with 'empty-topic-display' css class.