diff --git a/package.json b/package.json
index 9aeefa1..279d476 100644
--- a/package.json
+++ b/package.json
@@ -1,74 +1,6 @@
 {
   "name": "no-name",
   "license": "UNLICENSED",
-  "dependencies": {
-    "@polymer/iron-icon": "3.0.1",
-    "@polymer/iron-list": "3.1.0",
-    "@polymer/polymer": "3.2.0",
-    "@vaadin/flow-frontend": "./target/flow-frontend",
-    "@vaadin/router": "1.7.2",
-    "@vaadin/vaadin-app-layout": "2.2.0",
-    "@vaadin/vaadin-button": "2.4.0",
-    "@vaadin/vaadin-combo-box": "5.4.7",
-    "@vaadin/vaadin-custom-field": "1.3.0",
-    "@vaadin/vaadin-details": "1.2.0",
-    "@vaadin/vaadin-dialog": "2.5.2",
-    "@vaadin/vaadin-form-layout": "2.3.0",
-    "@vaadin/vaadin-grid": "5.7.7",
-    "@vaadin/vaadin-icons": "4.3.2",
-    "@vaadin/vaadin-item": "2.3.0",
-    "@vaadin/vaadin-list-box": "1.4.0",
-    "@vaadin/vaadin-lumo-styles": "1.6.1",
-    "@vaadin/vaadin-material-styles": "1.3.2",
-    "@vaadin/vaadin-menu-bar": "1.2.1",
-    "@vaadin/vaadin-notification": "1.6.0",
-    "@vaadin/vaadin-ordered-layout": "1.4.0",
-    "@vaadin/vaadin-progress-bar": "1.3.0",
-    "@vaadin/vaadin-select": "2.4.0",
-    "@vaadin/vaadin-split-layout": "4.3.0",
-    "@vaadin/vaadin-text-field": "2.8.2",
-    "@vaadin/form": "./target/flow-frontend/form",
-    "@vaadin/vaadin-avatar": "1.0.3",
-    "open": "^7.2.1",
-    "@vaadin/vaadin-upload": "4.4.1",
-    "@vaadin/vaadin-date-time-picker": "1.4.0",
-    "@vaadin/vaadin-login": "1.2.0",
-    "@vaadin/vaadin-accordion": "1.2.0",
-    "@vaadin/vaadin-checkbox": "2.5.0",
-    "@vaadin/vaadin-time-picker": "2.4.0",
-    "@vaadin/vaadin-context-menu": "4.5.0",
-    "@vaadin/vaadin-tabs": "3.2.0",
-    "@vaadin/vaadin-radio-button": "1.5.1",
-    "lit-element": "2.3.1",
-    "@vaadin/vaadin-core-shrinkwrap": "18.0.5",
-    "@vaadin/vaadin-date-picker": "4.4.1",
-    "@vaadin-component-factory/vcf-tooltip": "1.3.13"
-  },
-  "devDependencies": {
-    "@types/validator": "13.1.0",
-    "awesome-typescript-loader": "5.2.1",
-    "chokidar": "^3.4.0",
-    "compression-webpack-plugin": "4.0.1",
-    "copy-webpack-plugin": "5.1.2",
-    "css-loader": "4.2.1",
-    "extract-loader": "5.1.0",
-    "html-webpack-plugin": "3.2.0",
-    "lit-css-loader": "0.0.4",
-    "lit-element": "^2.3.1",
-    "lit-html": "1.2.1",
-    "progress-webpack-plugin": "0.0.24",
-    "raw-loader": "4.0.0",
-    "script-ext-html-webpack-plugin": "2.1.4",
-    "terser": "4.6.7",
-    "typescript": "4.0.3",
-    "validator": "13.1.17",
-    "webpack": "4.42.0",
-    "webpack-babel-multi-target-plugin": "2.3.3",
-    "webpack-cli": "3.3.11",
-    "webpack-dev-server": "3.11.0",
-    "webpack-merge": "4.2.2"
-  },
-
   "vaadin": {
     "dependencies": {
       "lit-element": "2.3.1",
@@ -102,13 +34,11 @@
       "@vaadin/vaadin-details": "1.2.0",
       "@polymer/iron-icon": "3.0.1",
       "@vaadin/vaadin-time-picker": "2.4.0",
-      "@vaadin/vaadin-avatar": "1.0.3",
       "@vaadin/vaadin-context-menu": "4.5.0",
+      "@vaadin/vaadin-avatar": "1.0.3",
+      "@vaadin-component-factory/vcf-tooltip": "1.3.13",
       "@vaadin/vaadin-tabs": "3.2.0",
       "@vaadin/vaadin-radio-button": "1.5.1",
-      "@vaadin/vaadin-rich-text-editor": "1.3.0",
-      "@vaadin-component-factory/vcf-tooltip": "1.3.13"
-
       "@vaadin/vaadin-lumo-styles": "1.6.0",
       "@vaadin/vaadin-material-styles": "1.3.2",
       "open": "^7.2.1"
@@ -133,7 +63,7 @@
       "webpack-dev-server": "3.11.0",
       "extract-loader": "5.1.0"
     },
-    "hash": "8a8bb65418f58834b30cd258cd47da52573731720ea8967d4078487cb1253498"
+    "hash": "76239929559a31ed723a76c78e7c2e75d64de46a237e99dd95361916eb0c4d96"
   },
   "dependencies": {
     "lit-element": "2.3.1",
@@ -169,8 +99,9 @@
     "@vaadin/vaadin-details": "1.2.0",
     "@polymer/iron-icon": "3.0.1",
     "@vaadin/vaadin-time-picker": "2.4.0",
-    "@vaadin/vaadin-avatar": "1.0.3",
     "@vaadin/vaadin-context-menu": "4.5.0",
+    "@vaadin/vaadin-avatar": "1.0.3",
+    "@vaadin-component-factory/vcf-tooltip": "1.3.13",
     "@vaadin/vaadin-tabs": "3.2.0",
     "@vaadin/vaadin-radio-button": "1.5.1",
     "@vaadin/vaadin-lumo-styles": "1.6.0",
diff --git a/pom.xml b/pom.xml
index ba903ae..a6d5a69 100644
--- a/pom.xml
+++ b/pom.xml
@@ -180,6 +180,14 @@
                     <violationSeverity>warning</violationSeverity>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>9</source>
+                    <target>9</target>
+                </configuration>
+            </plugin>
         </plugins>
     </build>
 
diff --git a/src/main/resources/language/translation_de.properties b/src/main/resources/language/translation_de.properties
index 3aff95b..fee13ef 100644
--- a/src/main/resources/language/translation_de.properties
+++ b/src/main/resources/language/translation_de.properties
@@ -11,8 +11,6 @@ abs-rule=\\begin{prooftree}\
 \\BinaryInfC{$\\Gamma \\vdash t_1 \\ t_2 : \\tau_2$}\
 \\end{prooftree}
 
-test=hello world
-root.typicalc=Typicalc
 root.lambda=\u03BB
 root.typeInfer=Typisieren
 
diff --git a/src/main/resources/language/translation_en.properties b/src/main/resources/language/translation_en.properties
index e0fa3f2..81cd612 100644
--- a/src/main/resources/language/translation_en.properties
+++ b/src/main/resources/language/translation_en.properties
@@ -10,3 +10,6 @@ abs-rule=\
 \\LeftLabel{APP}\n\
 \\BinaryInfC{$\\Gamma \\vdash t_1 \\ t_2 : \\tau_2$}\n\
 \\end{prooftree}
+
+root.lambda=\u03BB
+root.typeInfer=Typisieren
\ No newline at end of file