add signature setting

For multiple users it helps to
keep track about who did what.

app/src/main/res/layout/activity_settings.xml

@@ -119,6 +119,28 @@
                 android:visibility="invisible"/>
         </RadioGroup>
 
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textStyle="bold"
+            android:text="@string/settings_signature" />
+
+        <EditText
+            android:id="@+id/settings_signature"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="20dp"
+            android:layout_marginTop="5dp"
+            android:inputType="textEmailAddress"
+            android:background="@drawable/textview_background"/>
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="30dp"
+            android:layout_marginTop="5dp"
+            android:text="@string/settings_signature_desc"/>
+
         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"

app/src/main/res/layout/dialog_event_detail.xml

@@ -4,7 +4,9 @@
     android:orientation="vertical"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:padding="20dp">
+    android:paddingTop="20dp"
+    android:paddingBottom="10dp"
+    android:paddingHorizontal="20dp">
 
     <TextView
         android:id="@+id/dialog_event_detail_type_emoji"
@@ -61,6 +63,14 @@
 
     </ScrollView>
 
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_horizontal"
+        android:id="@+id/dialog_event_detail_type_signature"
+        android:layout_marginBottom="5dp"
+        android:visibility="gone"/>
+
     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"

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

@@ -85,6 +85,8 @@
     <string name="no_connection_retry">Retry</string>
 
     <string name="settings_title">Settings</string>
+    <string name="settings_signature">Signature</string>
+    <string name="settings_signature_desc">Attach a signature to each event you create and for others to see. Useful if multiple people add events.</string>
     <string name="settings_storage">Choose where to save data</string>
     <string name="settings_storage_local">On device</string>
     <string name="settings_storage_local_desc">Most privacy-friendly solution: data doesn\'t leave your device</string>
@@ -136,6 +138,7 @@
     <string name="dialog_event_detail_delete_button">Delete</string>
     <string name="dialog_event_detail_quantity">Quantity</string>
     <string name="dialog_event_detail_notes">Notes</string>
+    <string name="dialog_event_detail_signature">by %s</string>
 
     <string name="dialog_add_logbook_title">Add logbook</string>
     <string name="dialog_add_logbook_logbookname">👶 Logbook name</string>