Configurable rate rounding (#5734)

* added invoice hydration of the issuer object
* added "rate calculator" mode
* new config to select rounding mode
* replace static calls with dependency injection

translations/system-configuration.de.xlf

@@ -310,6 +310,10 @@
         <source>copy_teams_on_create</source>
         <target>Übernehme Teams beim Erstellen neuer Einträge vom angemeldeten Benutzer</target>
       </trans-unit>
+      <trans-unit id="6AaVxB2" resname="invoice.rounding_mode" approved="yes">
+        <source>invoice.rounding_mode</source>
+        <target>Rundungsmodus</target>
+      </trans-unit>
     </body>
   </file>
 </xliff>

translations/system-configuration.en.xlf

@@ -310,6 +310,10 @@
         <source>copy_teams_on_create</source>
         <target>Take over teams from the logged-in user when creating new entries</target>
       </trans-unit>
+      <trans-unit id="6AaVxB2" resname="invoice.rounding_mode" approved="yes">
+        <source>invoice.rounding_mode</source>
+        <target>Rounding mode</target>
+      </trans-unit>
     </body>
   </file>
 </xliff>