fix pathing of translation files

Squashed commit of the following:

commit 13f2c178
Author: Manuel Kocher <manuel.kocher@tugraz.at>
Date:   Thu May 12 15:25:22 2022 +0200

    fix pathing of i18n files

commit 21309f2c
Merge: f69672e8 7a2e492e
Author: Manuel Kocher <manuel.kocher@tugraz.at>
Date:   Thu May 12 14:16:56 2022 +0200

    Merge branch 'master' into dbp-translation-component

commit f69672e8
Author: Manuel Kocher <manuel.kocher@tugraz.at>
Date:   Thu May 12 13:48:10 2022 +0200

    Remove unnecessary en translation text

commit 6d0df984
Author: Manuel Kocher <manuel.kocher@tugraz.at>
Date:   Thu May 12 13:36:45 2022 +0200

    Remove unnecessary imports and minor refactor

commit 6496d910
Author: Manuel Kocher <manuel.kocher@tugraz.at>
Date:   Thu May 12 13:24:51 2022 +0200

    Add lang-File attribute to README

commit 7a528144
Author: Manuel Kocher <manuel.kocher@tugraz.at>
Date:   Thu May 12 13:17:40 2022 +0200

    Add dbp-translation component and include it in showcase

toolkit-showcase/assets/dbp-toolkit-showcase.html.ejs

@@ -113,7 +113,7 @@
 <<%= name %>
     provider-root
     lang="de"
-    lang-file="<%= getUrl('/src/i18n/') %>"
+    lang-file="<%= getPrivateUrl('i18n/') %>"
     entry-point-url="<%= entryPointURL %>"
     nextcloud-auth-url="<%= nextcloudWebAppPasswordURL %>"
     nextcloud-web-dav-url="<%= nextcloudWebDavURL %>"

toolkit-showcase/rollup.config.js

@@ -168,6 +168,7 @@ Dependencies:
                     {src: 'assets/icon-*.png', dest: 'dist/' + (await getDistPath(pkg.name))},
                     {src: 'assets/apple-*.png', dest: 'dist/' + (await getDistPath(pkg.name))},
                     {src: 'assets/safari-*.svg', dest: 'dist/' + (await getDistPath(pkg.name))},
+                    {src: 'src/i18n', dest: 'dist/' + (await getDistPath(pkg.name))},
                     {
                         src: 'assets/manifest.json',
                         dest: 'dist',