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I did searches and couldn't find any other relevant uses of the phrases. The following phrases should be title case:

Batch Update Threads

• created_by: Created By
• created_between: Created Between
• last_post_between: Last Post Between
• reply_count_between: Reply Count Between
• first_post_likes_between: First Post Likes Between
• view_count_between: View Count Between
• move_to_forum: Move to Forum
• set_prefix: Set Prefix

Batch Update Users

• registered_between: Registered Between
• last_visited_between: Last Visited Between
• message_count_between: Message Count Between
• trophy_points_between: Trophy Points Between
• set_primary_user_group: Set Primary User Group
• add_secondary_user_group: Add Secondary User Group
• remove_secondary_user_group: Remove Secondary User Group
• set_custom_title: Set Custom User Title

There are also inconsistencies here because other field titles are in title case.