Function improvements (continued)

• Tweak text descriptions.
• Move TODO from different files to a single file.
• Add examples with both steam and smoke on the index page.
• Add text description of user score to the labeling page.
• Add a link to the introduction video to the index page.
• Add a link to the viewer for each video in the gallery when in the researcher mode.
• Replace 'Collection' to 'Contribution'.
• Add raw score (the number of viewed unlabeled videos) for each user to the database.
• Display the raw score in the front-end.
• Remove user_raw_score and user_score from the connection table.
• Add the api call to get label statistics.
• Show the label statistics on the front-end when labeling.
• Add more positive videos.
• Improve the flow for adding videos.
• When querying batches, make sure that half of them are partially labeled. In this way, we can speed up labeling.
• Now the gold standard videos have at least one negative and one positive videos, which prevents spamming.
• Fix the migration script problem.
• Upgrade python packages.
• Add loading icon for the galley.
• Improve loading icon logic for the labeling tool.
• Increase the countdown duration when labeling.
• Reduce the number of videos at the first page to 16 because of video number restrictions before mobile safari version 12.
• Fix a problem that when google sign-in api failed, the system get stuck in the loading state.
• Update website template to improve the functionality of the dialog box.
• Update website template to improve accessibility and usability.
• Fix a css bug in the submit button when counting down.
• Improve the automatic check for video autoplay.
• Fix a bug that in track protection mode (Firefox), the page will hang forever because the browser is unable to load the google analytics.
• Improve the track protection detection in the google analytics tracker.
• Add browser support checks.
• Add a script to mark bad videos.
• Improve video autoplay detection.
• Add frequently asked questions (FAQ) page.
• Add a google form to collect feedback on the FAQ page.
• Change max-age in the apache2 cache control to 5 seconds (this used to be 60 seconds, and the browser will cache the label statistics, which can be wrong).
• Fix other miscellaneous bugs.