Update Copyright notice in about window

[alex-nitrokey]

Copyright notice in about window does not reflect the actual years. I'm not a lawyer, but might be a problem.

nitrokey-app/src/ui/aboutdialog.ui

Line 673 in afa4235

<string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;&lt;span style=&quot; font-size:10pt; font-style:italic;&quot;&gt;Copyright 2016 by NitrokeyUG. &lt;/span&gt;&lt;/p&gt;&lt;p&gt;&lt;span style=&quot; font-size:10pt; font-style:italic;&quot;&gt;This software is licensed under the &lt;/span&gt;&lt;a href=&quot;https://www.gnu.org/licenses/&quot;&gt;&lt;span style=&quot; font-size:10pt; font-style:italic; text-decoration: underline; color:#c80636;&quot;&gt;GNU General Public License v3&lt;/span&gt;&lt;/a&gt;&lt;span style=&quot; font-size:10pt; font-style:italic;&quot;&gt;.&lt;/span&gt;&lt;/p&gt;&lt;p&gt;&lt;a href=&quot;https://nitrokey.com&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#c80636;&quot;&gt;www.nitrokey.com&lt;/span&gt;&lt;/a&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>

Suggestion: change to 2016-2018 in all languages and update accordingly in future.

[szszszsz]

• Actually this should be 2012-2018.
• Listing of 3rd party projects will be corrected as well.

[szszszsz]

Copyright updated in: e408e69