Same site name in multiple languages
I ended up using the suggestion of Robin Schambach, in front-end templates using the {{ site.group.name }}
E-mail contents can be changed in the admin section, using {{currentSite.group.name}}
Craft 2:
settings -&gt; email -&gt; Messages
Craft 3.0:
settings -&gt; email -&gt; Messages
Craft 3.1:
Utilities -&gt; System Messages