Added new relative date input shorthand (closes #1773)

changelog/66_UNRELEASED_xxxx-xx-xx.md

@@ -5,6 +5,7 @@
 - When using LDAP authentication, the configured `LDAP_UID_ATTR` is now used to compare if the user already exists instead of the username entered on the login page (that prevents creating multiple users if you entere the username in different notations) (thanks @FloSet)
 - When using reverse proxy authentication (`ReverseProxyAuthMiddleware`), it's now also possible to pass the username in an environment variable instead of an HTTP header (new `config.php` option `REVERSE_PROXY_AUTH_USE_ENV`) (thanks @Forceu)
 - Performance improvements (page loading time) of the recipes page
+- New input shorthand `[+/-]n[d/m/y]` for date fields to quickly input a date relative to today (adding `+` or subtracting `-` the number of days/months/years, see the full list of available shorthands [here](https://github.com/grocy/grocy#input-shorthands-for-date-fields))
 - Fixed that stock entry labels on purchase were printed, even when "No label" was selected (was only a problem when running label printer WebHooks server side)
 - Fixed that when adding missing recipe ingredients, with the option "Only check if any amount is in stock" enabled, to the shopping list, unit conversions (if any) weren't considered
 - Fixed that the meal plan showed the total calories per recipe (instead of per serving as stated by the suffix)