Find & Replace and Autotag watched words were not completely exported
and import did not work with these either. This commit changes the
input and output format to CSV, which allows for a secondary column.
This change is backwards compatible because a CSV file with only one
column has one value per line.
This commit contains 3 features:
- FEATURE: Allow downloading watched words
This introduces a button that allows admins to download watched words per action in a `.txt` file.
- FEATURE: Allow clearing watched words in bulk
This adds a "Clear All" button that clears all deleted words per action (e.g. block, flag etc.)
- FEATURE: List all blocked words contained in the post when it's blocked
When a post is rejected because it contains one or more blocked words, the error message now lists all the blocked words contained in the post.
-------
This also changes the format of the file for importing watched words from `.csv` to `.txt` so it becomes inconsistent with the extension of the file when watched words are exported.
