This is because of the positioning of the elements which triggers
a clipboard.js bug: zenorocha/clipboard.js#382
Removing the whitespace around the HTML tags works around this issue.

closes: #1041

ClipboardJS is initialised once in the bundle for class="copy",
not initialised on each page that uses it.

- Add class pure-button-red instead of overwriting primary
- Create a group of 2 button-elements where one is hollow, useful
to show input-files or error-ids.
- Update templates accordingly

- Change metadatabox to a general code-box, code-box-content and code-box-title
- Change xmlarea to text-area
- Update templates that where using old classes

- copy-to clipboard buttons
- textareas

- Change input type=file: style it like a label and add js function.

- Missing translations
- Converted metadata needs to be updated as well.

- Add dependencies
- Change link in script postload, base.twig
- Add function in Script.js
- Delete postload block in metadata-converter.twig and call clipboard function on button click.