introduces plugin setting for name of unit custom field

- after deploying the new code, in a console, run

Setting.plugin_redmine_supply = Setting.plugin_redmine_supply.merge("unit_cf" => "New Name Of Custom Field")

- restart server and the renamed unit custom field will be recognized

Author: jkraemer

init.rb

@@ -14,6 +14,10 @@
 
   requires_redmine version_or_higher: '3.4.0'
 
+  settings default: {
+    "unit_cf" => "Unit"
+  }
+
   project_module :supply do
 
     permission :manage_supply_items, {

lib/redmine_supply.rb

@@ -14,6 +14,7 @@ def self.setup
   end
 
   def self.unit_cf
-    SupplyItemCustomField.find_by_name 'Unit'
+    name = Setting.plugin_redmine_supply["unit_cf"].presence || "Unit"
+    SupplyItemCustomField.find_by_name name
   end
 end