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

src/Utils/LocaleHelper.php

@@ -24,6 +24,10 @@ final class LocaleHelper
      * @var NumberFormatter
      */
     private $numberFormatter;
+    /**
+     * @var NumberFormatter
+     */
+    private $durationFormatter;
     /**
      * @var NumberFormatter
      */
@@ -51,10 +55,12 @@ final class LocaleHelper
             $value = 0;
         }
 
-        return $this->getNumberFormatter()->format((float) $value);
+        return $this->getDurationFormatter()->format((float) $value);
     }
 
     /**
+     * Only used in twig filter |amount and invoice templates
+     *
      * @param string|float $amount
      * @return bool|false|string
      */
@@ -133,6 +139,16 @@ final class LocaleHelper
         return $this->numberFormatter;
     }
 
+    private function getDurationFormatter(): NumberFormatter
+    {
+        if (null === $this->numberFormatter) {
+            $this->durationFormatter = new NumberFormatter($this->locale, NumberFormatter::DECIMAL);
+            $this->durationFormatter->setAttribute(NumberFormatter::FRACTION_DIGITS, 2);
+        }
+
+        return $this->durationFormatter;
+    }
+
     private function getMoneyFormatter(bool $withCurrency = true): NumberFormatter
     {
         if ($withCurrency) {