Fixes for 1.12 (#4655)

* fix missing locales
* bump composer packages
* changed translations
* assert timezone on customer
* include user accountNumber in excel export
* improve next customer number calculation
* fix z-index of contextmenu / action dropdown

public/build/manifest.json

@@ -1,7 +1,7 @@
 {
-  "build/app.css": "/build/app.4ccab775.css",
-  "build/app.js": "/build/app.8d1b738d.js",
-  "build/app-rtl.css": "/build/app-rtl.2e426047.css",
+  "build/app.css": "/build/app.3501ccee.css",
+  "build/app.js": "/build/app.6450be5e.js",
+  "build/app-rtl.css": "/build/app-rtl.670658da.css",
   "build/app-rtl.js": "/build/app-rtl.3d445498.js",
   "build/export-pdf.css": "/build/export-pdf.d8a6c23b.css",
   "build/export-pdf.js": "/build/export-pdf.d367a32e.js",
@@ -11,7 +11,7 @@
   "build/invoice-pdf.js": "/build/invoice-pdf.ce9aace0.js",
   "build/chart.js": "/build/chart.f5becfac.js",
   "build/calendar.css": "/build/calendar.bb473428.css",
-  "build/calendar.js": "/build/calendar.a1cbcd7b.js",
+  "build/calendar.js": "/build/calendar.d45e4af5.js",
   "build/dashboard.css": "/build/dashboard.18f5a8b7.css",
   "build/dashboard.js": "/build/dashboard.6774a712.js",
   "build/runtime.js": "/build/runtime.f0079159.js",