Add a little padding for the install tool license's view

Signed-off-by: xchs <github@gmx.net>
Store integers bigger than `PHP_INT_MAX` as string (see #5939)
Decode IDNA domains in any system mail (see #5932)
Correctly validate the options in `Widget::isValidOption()` (see #5951)
Hide the cache message in the repository manager (see #5966)
Replace all insert tags when exporting a page as PDF (see #5990)
Make the GD image max width and height parameters mandatory (see #5940)
Correctly catch the `Swift_RfcComplianceException` in the newsletter class (see #5992)
Fix the newslist pagination count (see #5997)
Validate the e-mail address when creating an admin user (see #6003)
Pass the module to `getAttributesFromDca()` (see #6002)
Merge pull request #6030 from xchs/install-tool-license
Preserve the repository tables when importing a theme (see #6037)
Add an option to purge the search cache (see #6041)
Add the Czech typolinks translations (thanks to ShiraNai7) (see #6051)