Add a toggle to quickly change the pending status of transactions

Currently, when you click on a saved transaction, you must manually open it in "edit mode" to change its parameters.

While this is the correct behavior for settings that are expected to be changed infrequently, it should be possible to quickly toggle the status of transactions from pending to normal, and then lock the choice and disable the toggle.

Note that it shouldn't be possible to do the opposite from the transaction overview, but only in "edit mode", because this causes changes in reports and graphs and should only be done on purpose. For this reason, the user should be informed by a short explanation below the option.