v1.5.1

Version 1.5.1 is a bugfix release for the new main version 1.5.0 released yesterday. It fixes an issue with the browser cache and a minor visual issue in the project list.

• Changed one of the API parameters for the request-submit-token endpoint to optional. This will fix issues where the frontend JavaScript file is cached in the browser and a submit token request fails due to a missing parameter. Additionally, the field may be left blank for a valid purpose, so it should not be required in the first place. Reported by @BDphilBen in #426
• Fixed a minor visual issue with the info message in the empty project list