Update Translation: Saving ROOT Files

This includes the German translation for the .root file saving dialog.

l10n/fp311online-de.ts

@@ -148,12 +148,12 @@ y Torr</translation>
 <context>
     <name>Fp311Online::ClientGui</name>
     <message>
-        <location filename="../src/clientgui.cpp" line="134"/>
+        <location filename="../src/clientgui.cpp" line="137"/>
         <source>Connection Error</source>
         <translation>Verbindungsfehler</translation>
     </message>
     <message>
-        <location filename="../src/clientgui.cpp" line="135"/>
+        <location filename="../src/clientgui.cpp" line="138"/>
         <source>There is a problem with the connection to the server:
 
 </source>
@@ -162,12 +162,12 @@ y Torr</translation>
 </translation>
     </message>
     <message>
-        <location filename="../src/clientgui.cpp" line="145"/>
+        <location filename="../src/clientgui.cpp" line="148"/>
         <source>Connection Interrupted</source>
         <translation>Verbindung unterbrochen</translation>
     </message>
     <message>
-        <location filename="../src/clientgui.cpp" line="146"/>
+        <location filename="../src/clientgui.cpp" line="149"/>
         <source>The connection to the server has been disconnected, therefore this application cannot continue.
 Please check your network connection, restart the application and login again.
 As the simulated experiment is running on the server, there is a good chance that no data has been lost.</source>
@@ -176,12 +176,22 @@ Bitte prüfe deine Internetverbindung, starte die Anwendung neu und melde dich n
 Da das simulierte Experiment auf dem Server läuft, stehen die Chancen gut, dass keine Daten verloren gegangen sind.</translation>
     </message>
     <message>
-        <location filename="../src/clientgui.cpp" line="69"/>
+        <location filename="../src/clientgui.cpp" line="278"/>
+        <source>Save Content of Histogram to ROOT File</source>
+        <translation>Histogram-Inhalt in ROOT-Datei speichern</translation>
+    </message>
+    <message>
+        <location filename="../src/clientgui.cpp" line="280"/>
+        <source>ROOT files (*.root)</source>
+        <translation>ROOT-Dateien (*.root)</translation>
+    </message>
+    <message>
+        <location filename="../src/clientgui.cpp" line="72"/>
         <source>Experiment Part not available</source>
         <translation>Versuchsteil nicht verfügbar</translation>
     </message>
     <message>
-        <location filename="../src/clientgui.cpp" line="69"/>
+        <location filename="../src/clientgui.cpp" line="72"/>
         <source>This part of the experiment is currently left out, because it has also been left out in the real experiment in the recent years.
 This measurement only confirms the calibraton of the setup and takes a long time due to the low activity of the real-world ²⁴¹Am source.</source>
         <translation>Dieser Teil des Versuchs wird aktuell ausgelassen, da er in dem realen Experiment in den letzten Jahren ebenfalls ausgelassen wurde.