Merge branch 'mjog/589-attachment-keyword-check' into 'mainline'

Attachment keyword fixes

Closes #589

See merge request !334

(cherry picked from commit 647ef90c)

5732d23e ui/composer-web-view.js: Add element blacklist to htmlToText
a8ef91f3 ui/composer-web-view.js: Improve keyword detection
69e3cdf9 Fix ComposerPageState::containsAttachmentKeyword
17a23bc5 ComposerWidget: Send both en and localised attachment keywords
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