release 1.16.9 (#3018)

* fix filter action display
* allow to set system configuration during runtime
* bump version
* use deepl pro free to translate missing keys
* replacing broken Github action

.github/workflows/testing.yaml

@@ -35,8 +35,18 @@ jobs:
                     extensions: mbstring, xml, ctype, iconv, intl, mysql, zip, gd, ldap
                     tools: cs2pr:1.1.0
 
+            -   name: Determine composer cache directory
+                id: composer-cache
+                run: "echo \"::set-output name=directory::$(composer config cache-dir)\""
+
+            -   name: Cache Composer dependencies
+                uses: actions/cache@v2
+                with:
+                    path: "${{ steps.composer-cache.outputs.directory }}"
+                    key: ${{ runner.os }}-${{ matrix.php }}-${{ hashFiles('**/composer.lock') }}
+
             -   name: Install dependencies
-                uses: ramsey/composer-install@v1
+                run: composer install
 
             -   name: Validate Composer
                 run: composer validate --strict