Duplicate key values in i18n files

[jindrichmynarz]

I18n files, such as /src/main/resources/cz/opendata/tenderstats/i18n/buyer.properties, contain many keys with duplicit values. For example:

editevent.help=On this screen, you can create a contract. Enter a title for the contract and at least one CPV code describing the object of the contract. You don't need to know the exact code, just start typing either the CPV code or its label and let autocomplete help you. When you select the contract type, you will be asked to enter more information depending on its type. Mandatory fields have a red asterisk next to them.

...and...

createevent.help=On this screen, you can create a contract. Enter a title for the contract and at least one CPV code describing the object of the contract. You don't need to know the exact code, just start typing either the CPV code or its label and let autocomplete help you. When you select the contract type, you will be asked to enter more information depending on its type. Mandatory fields have a red asterisk next to them.

These keys with duplicit values should be singled out, so that the same locale doesn't have to be maintained in multiple places.