Fixed

app/build.gradle

@@ -27,24 +27,24 @@ android {
 
 
 dependencies {
-    implementation 'com.android.support:recyclerview-v7:28.0.0-beta01'
+    implementation 'com.android.support:recyclerview-v7:28.0.0-rc01'
     implementation fileTree(include: ['*.jar'], dir: 'libs')
     androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
-    implementation 'com.android.support:appcompat-v7:28.0.0-beta01'
-    implementation 'com.android.support:preference-v7:28.0.0-beta01'
-    implementation 'com.android.support:design:28.0.0-beta01'
+    implementation 'com.android.support:appcompat-v7:28.0.0-rc01'
+    implementation 'com.android.support:preference-v7:28.0.0-rc01'
+    implementation 'com.android.support:design:28.0.0-rc01'
     implementation 'com.android.support.constraint:constraint-layout:1.1.2'
     implementation 'com.android.volley:volley:1.0.0'
     //noinspection GradleDependency
     implementation 'com.google.android.gms:play-services-auth:15.0.0'
-    implementation 'com.android.support:support-v4:28.0.0-beta01'
+    implementation 'com.android.support:support-v4:28.0.0-rc01'
     testImplementation 'junit:junit:4.12'
     implementation fileTree(include: ['*.jar'], dir: 'libs')
-    implementation 'com.android.support:appcompat-v7:28.0.0-beta01'
+    implementation 'com.android.support:appcompat-v7:28.0.0-rc01'
     implementation 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'
-    implementation 'com.android.support:support-v4:28.0.0-beta01'
+    implementation 'com.android.support:support-v4:28.0.0-rc01'
     implementation 'org.jetbrains:annotations-java5:15.0'
     //implementation 'com.github.quivr:android-week-view:2.0.2'//com.github.alamkanak:android-week-view:1.2.6
     implementation 'com.ms-square:expandableTextView:0.1.4'

app/src/main/res/values/preferences.xml

@@ -4,6 +4,6 @@
         <item>@string/pref_price_group</item>
         <item>@string/pref_price_group_default</item>
     </string-array>
-    <string name="pref_price_group">pref_price_group</string>
-    <string name="pref_price_group_default">all</string>
+    <string name="pref_price_group" translatable="false">pref_price_group</string>
+    <string name="pref_price_group_default" translatable="false">all</string>
 </resources>
\ No newline at end of file

app/src/main/res/xml/preferences.xml

@@ -13,6 +13,6 @@
         android:title="@string/open_data_policy"
         android:summary="@string/open_data_policy_summary">
         <intent android:action="android.intent.action.VIEW"
-            android:data="http://www.android.com" />
+            android:data="https://gogs.sebse.de/Caesar2011/FUPlanner/src/master/datenschutz.md" />
     </PreferenceScreen>
 </PreferenceScreen>
\ No newline at end of file