### The Problem

Using native Qt translation files (TS, `*.ts`) for exchanging with Transifex platform limits means to provide context
to translators to the only category:

| C++ source code                               | TS XML element                                 | Transifex metadata
|-----------------------------------------------|------------------------------------------------|:------------------:
| Class Name                                    | `<name>`ClassName`</name>`                     | Context
| `disambiguation` parameter of `tr()` function | `<comment>`Short comment`</comment>`           | N/A
| [Translator Comments](https://doc.qt.io/qt-5/i18n-source-translation.html#translator-comments) `//: ...` | `<extracomment>`Nice comment.`</extracomment>` | N/A

More details:
- https://docs.transifex.com/formats/introduction
- https://docs.transifex.com/formats/qt-ts
- https://doc.qt.io/qt-5/linguist-ts-file-format.html

### The Solution

[XLIFF](https://en.wikipedia.org/wiki/XLIFF) file format is supported by Transifex much better.

And Qt provides us with a stand-alone conversion tool `lconvert`.

```sh
$ lconvert -o bitcoin_es.xlf -i bitcoin_en.ts
```

Now more context options are available:

| TS XML element                                 | XLIFF XML element                               | Transifex metadata
|------------------------------------------------|-------------------------------------------------|:------------------:
| `<name>`ClassName`</name>`                     | `<group resname="ClassName">`...`</group>`      | yes
| `<comment>`Short comment`</comment>`           | `<context>`Short comment`</context>`            | yes
| `<extracomment>`Nice comment.`</extracomment>` | `<note from="developer">`Nice comment.`</note>` | yes

More details:
- https://docs.transifex.com/formats/xliff
- https://code.qt.io/cgit/qt/qttools.git/tree/src/linguist/lconvert/lconvert.pro?h=5.12.10

---

Looking for Concept (N)ACKs.
break;
    case ReceivingTab:
        ui->labelExplanation->setText(tr("These are your Bitcoin addresses for receiving payments. Use the 'Create new receiving address' button in the receive tab to create new addresses.\nSigning is only possible with addresses of the type 'legacy'."));
        ui->deleteAddress->setVisible(false);
        ui->newAddress->setVisible(false);
        break;
    }
    
    QAction *copyAddressAction = new QAction(tr("&Copy Address"), this);
    QAction *copyLabelAction = new QAction(tr("Copy &Label"), this);
    QAction *editAction = new QAction(tr("&Edit"), this);
    deleteAction = new QAction(ui->deleteAddress->text(), this);
    
    contextMenu = new QMenu(this);
    contextMenu->addAction(copyAddressAction);
    contextMenu->addAction(copyLabelAction);
    contextMenu->addAction(editAction);
    if(tab == SendingTab)
        contextMenu->addAction(deleteAction);
    contextMenu->addSeparator();
    
    connect(copyAddressAction, &QAction::triggered, this, &AddressBookPage::on_copyAddress_clicked);
    connect(copyLabelAction, &QAction::triggered, this, &AddressBookPage::onCopyLabelAction);
    connect(editAction, &QAction::triggered, this, &AddressBookPage::onEditAction);
    connect(deleteAction, &QAction::triggered, this, &AddressBookPage::on_deleteAddress_clicked);
    connect(ui->tableView, &QWidget::customContextMenuRequested, this, &AddressBookPage::contextualMenu);
    connect(ui->closeButton, &QPushButton::clicked, this, &QDialog::accept);
    GUIUtil::handleCloseWindowShortcut(this);
}
AddressBookPage::~AddressBookPage()