Unsaved tags are shown in fast edit tags window

[Jennifer Häfner]

When editing tags in the modal fast editing dialog, you type a tag, and then you close the window without saving. When you open the window again, the tag that you typed but didn't save is still there.

[Daniel Zoller]

Please also embed only one tag edit form and reuse it for all editable posts

[Viktor Hemsen]

fix #2536 remove all added tags on modal dismiss in custom.js

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