Cb lang (#24)

* feat: localization logic for datatables

* feat: translations added WIP

* feat: lang key added to _config.yml

* feat: added translations with complex html fields

* feat: more translations

* feat: more translations

* feat: merge hell fix

* feat: more translations

* fix: more translations

* fix: more translations

* fix: improved translations

* fix: Update _layouts/timeline.html

Co-authored-by: Nico Görlich <73133626+koilebeit@users.noreply.github.com>

* fix: search button placeholder translated

* fix: results found translation added

* fix: single tranlsation fixed

* fix: search page translations fixed

* fix: merge issues resolved

* feat: de enabled

* fix: possible fix for #54

* feat: 404 translated

---------

Co-authored-by: Nico Görlich <73133626+koilebeit@users.noreply.github.com>

404.html

@@ -1,13 +1,11 @@
 ---
-title: Page Not Found
+title: Seite nicht gefunden
 layout: page
 permalink: /404.html
-# this creates a 404 page automatically handled by GitHub Pages
-# the cow is from the linux program "cowsay"
 ---
 
 <h1>404?</h1>
-<p>Sorry, but the page you were trying to view does not exist.</p>
+<p>Die Seite, die Sie aufrufen wollten, existiert leider nicht.</p>
 
 <pre><code>
  ____________

_config.yml

@@ -10,7 +10,7 @@
 # site domain, full URL to the production location of your collection
 url: https://forschung.stadtgeschichtebasel.ch/
 # path to location on the domain if necessary e.g. /digital/hjccc
-baseurl:
+# baseurl:
 # location of code, the full url to your github repository
 source-code: https://github.com/Stadt-Geschichte-Basel/forschung.stadtgeschichtebasel.ch
 
@@ -28,6 +28,8 @@ description: "Auf der Forschungsdatenplattform von Stadt.Geschichte.Basel finden
 keywords: basel;history;stadtgeschichte
 # creator of the digital collection, to appear in meta tags; we typically use our GitHub usernames but feel free to just use your name
 author: Stadt.Geschichte.Basel
+# language of the site, used in meta tags and GUI elements
+lang: de
 
 ##########
 # COLLECTION SETTINGS