prepare release 1.15 (#2707)

* bump version
* fix invisible class on labels
* fail safe removal of foreign key
* check if optional form field exists before accessing it
* silently ignore stopped timesheets
* prevent colliding parameter names
* make sure decimal duration is always rendered with two decimals
* simplify translation
* fix #2751 ANSI_QUOTES
* rename composer task
* fix billable statistic rates
* added missing translation for export

translations/messages.de.xlf

@@ -460,7 +460,7 @@
       </trans-unit>
       <trans-unit id="label.my_team_projects">
         <source>label.my_team_projects</source>
-        <target>Team Projekte &amp; Budgets</target>
+        <target>Meine Projekte</target>
       </trans-unit>
       <trans-unit id="label.progress">
         <source>label.progress</source>
@@ -1126,6 +1126,10 @@
         <source>export.warn_result_amount</source>
         <target>Ihre Suche führt zu %count% Ergebnissen. Sollte der Export fehlschlagen, müssen Sie die Suche weiter eingrenzen.</target>
       </trans-unit>
+      <trans-unit id="label.type">
+        <source>label.type</source>
+        <target>Typ</target>
+      </trans-unit>
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