Merge bitcoin-core/gui#430: Improvements to the open up transaction in third-party link action

2ccde2f9329d2685563b09ff0830f0d5916f57d5 qt: hyphenate usage of third-party modifier (Jarol Rodriguez)
8177578b296adb82fb8ab6c64cd76b832ebcc132 qt: ensure seperator when adding third-party transaction links (Jarol Rodriguez)
a70a98075a0d258d41c1310553a2337538a1d80c qt: improve text for open third-party tx url action (Jarol Rodriguez)
9980f4aa5eaf3c0f62cf699d6a9c4677a1ea3365 qt, refactor: simplify third-party tx url action through overload (Jarol Rodriguez)

Pull request description:

  [#4092](https://github.com/bitcoin/bitcoin/pull/4092) introduced the ability to open up a transaction in a block explorer. This improves the related code by simplifying the addition and connection of the action through an [overloaded](https://doc.qt.io/archives/qt-5.9/qmenu.html#addAction-5) `addAction` function and prepends action description text to the host, "Show in". The reason to add this text is to make it clear what the action does. It also creates a clearer mental correlation between a user doing the work to add the 3rd-party tx link and this new menu action popping up.

  This updates the setting text so that "third-party" is hyphenated. It should be hyphenated because it is being used as a modifier of both "URL" and "transaction URLs".

  Additionally, this fixes #431 by ensuring that the seperator will be added before creating action.

  Screenshots of visual changes:

  **Context menu actions**
  |   master   |   pr   |
  |--------------|--------|
  | <img width="248" alt="3pt-master" src="https://user-images.githubusercontent.com/23396902/134618354-00278ac6-5094-44ee-8ba7-fe648fdcb7d2.png"> | <img width="248" alt="3pt-pr" src="https://user-images.githubusercontent.com/23396902/134618364-ddb64269-e5ee-40af-a2a6-1922001b6f4e.png"> |

  **Setting text**
  (tooltip text containing usage of "third-party" is also properly hyphenated)
  |   master   |   pr   |
  |--------------|--------|
  | ![unnamed](https://user-images.githubusercontent.com/23396902/134854070-fb299ba5-3491-487f-b37f-c0cd96514353.png) | ![pr-hyphenate](https://user-images.githubusercontent.com/23396902/134854127-88630cc2-a178-4376-a569-f413f66eba0d.png) |

ACKs for top commit:
  stratospher:
    tested ACK 2ccde2f.
  promag:
    Code view ACK 2ccde2f9329d2685563b09ff0830f0d5916f57d5.
  hebasto:
    ACK 2ccde2f9329d2685563b09ff0830f0d5916f57d5

Tree-SHA512: 8dfcd539a1d41c8abf3c8208d150d1480d4ef81a008de826299e8bad1dfa6e3c49dc76d041c5946fafcf0b033eebb9b9fbd3d49ba6d8af93dd388c488e92f143

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