Preparing 3.4 changelogs

Modules/Core/changelog.yml

 url: https://github.com/AsgardCms/Platform
 versions:
+    "3.4.0@unreleased":
+        changed:
+            - Define the warning callback on the SetAppKey
     "3.3.0":
         changed:
             - Updating vue-simple-mde to avoid 'marked' warning with vuejs 2.5

Modules/Setting/changelog.yml

 url: https://github.com/AsgardCms/Platform
 versions:
+    "3.4.0@unreleased":
+        changed:
+            - Fix settings with falsey values not getting returned
     "3.1.0":
         changed:
             - Checking for null value instead of empty for non translatable settings

Modules/Translation/changelog.yml

 url: https://github.com/AsgardCms/Platform
 versions:
+    "3.4.0@unreleased":
+        changed:
+            - Dutch translations updated
     "3.1.0":
         added:
             - New translations for Media and Page modules