[qt] change µBTC to bits

* Now that we have bip176, change "µBTC" to the more colloquial "bits"

* We retain the `µBTC (bits)` description in dropdowns and status bars.
  The more concise "bits" is used when appended to numbers.

Signed-off-by: William Casarin <jb55@jb55.com>

src/qt/bitcoingui.cpp

@@ -1206,7 +1206,7 @@ UnitDisplayStatusBarControl::UnitDisplayStatusBarControl(const PlatformStyle *pl
     const QFontMetrics fm(font());
     for (const BitcoinUnits::Unit unit : units)
     {
-        max_width = qMax(max_width, fm.width(BitcoinUnits::name(unit)));
+        max_width = qMax(max_width, fm.width(BitcoinUnits::longName(unit)));
     }
     setMinimumSize(max_width, 0);
     setAlignment(Qt::AlignRight | Qt::AlignVCenter);
@@ -1225,7 +1225,7 @@ void UnitDisplayStatusBarControl::createContextMenu()
     menu = new QMenu(this);
     for (BitcoinUnits::Unit u : BitcoinUnits::availableUnits())
     {
-        QAction *menuAction = new QAction(QString(BitcoinUnits::name(u)), this);
+        QAction *menuAction = new QAction(QString(BitcoinUnits::longName(u)), this);
         menuAction->setData(QVariant(u));
         menu->addAction(menuAction);
     }
@@ -1250,7 +1250,7 @@ void UnitDisplayStatusBarControl::setOptionsModel(OptionsModel *_optionsModel)
 /** When Display Units are changed on OptionsModel it will refresh the display text of the control on the status bar */
 void UnitDisplayStatusBarControl::updateDisplayUnit(int newUnits)
 {
-    setText(BitcoinUnits::name(newUnits));
+    setText(BitcoinUnits::longName(newUnits));
 }
 
 /** Shows context menu with Display Unit options by the mouse coordinates */

src/qt/bitcoinunits.cpp

@@ -36,24 +36,33 @@ bool BitcoinUnits::valid(int unit)
     }
 }
 
-QString BitcoinUnits::name(int unit)
+QString BitcoinUnits::longName(int unit)
 {
     switch(unit)
     {
     case BTC: return QString("BTC");
     case mBTC: return QString("mBTC");
-    case uBTC: return QString::fromUtf8("μBTC");
+    case uBTC: return QString::fromUtf8("µBTC (bits)");
     default: return QString("???");
     }
 }
 
+QString BitcoinUnits::shortName(int unit)
+{
+    switch(unit)
+    {
+    case uBTC: return QString::fromUtf8("bits");
+    default:   return longName(unit);
+    }
+}
+
 QString BitcoinUnits::description(int unit)
 {
     switch(unit)
     {
     case BTC: return QString("Bitcoins");
     case mBTC: return QString("Milli-Bitcoins (1 / 1" THIN_SP_UTF8 "000)");
-    case uBTC: return QString("Micro-Bitcoins (1 / 1" THIN_SP_UTF8 "000" THIN_SP_UTF8 "000)");
+    case uBTC: return QString("Micro-Bitcoins (bits) (1 / 1" THIN_SP_UTF8 "000" THIN_SP_UTF8 "000)");
     default: return QString("???");
     }
 }
@@ -121,7 +130,7 @@ QString BitcoinUnits::format(int unit, const CAmount& nIn, bool fPlus, Separator
 
 QString BitcoinUnits::formatWithUnit(int unit, const CAmount& amount, bool plussign, SeparatorStyle separators)
 {
-    return format(unit, amount, plussign, separators) + QString(" ") + name(unit);
+    return format(unit, amount, plussign, separators) + QString(" ") + shortName(unit);
 }
 
 QString BitcoinUnits::formatHtmlWithUnit(int unit, const CAmount& amount, bool plussign, SeparatorStyle separators)
@@ -176,7 +185,7 @@ QString BitcoinUnits::getAmountColumnTitle(int unit)
     QString amountTitle = QObject::tr("Amount");
     if (BitcoinUnits::valid(unit))
     {
-        amountTitle += " ("+BitcoinUnits::name(unit) + ")";
+        amountTitle += " ("+BitcoinUnits::shortName(unit) + ")";
     }
     return amountTitle;
 }
@@ -197,7 +206,7 @@ QVariant BitcoinUnits::data(const QModelIndex &index, int role) const
         {
         case Qt::EditRole:
         case Qt::DisplayRole:
-            return QVariant(name(unit));
+            return QVariant(longName(unit));
         case Qt::ToolTipRole:
             return QVariant(description(unit));
         case UnitRole:

src/qt/bitcoinunits.h

@@ -76,8 +76,10 @@ public:
     static QList<Unit> availableUnits();
     //! Is unit ID valid?
     static bool valid(int unit);
+    //! Long name
+    static QString longName(int unit);
     //! Short name
-    static QString name(int unit);
+    static QString shortName(int unit);
     //! Longer description
     static QString description(int unit);
     //! Number of Satoshis (1e-8) per unit

src/qt/recentrequeststablemodel.cpp

@@ -123,7 +123,7 @@ void RecentRequestsTableModel::updateAmountColumnTitle()
 /** Gets title for amount column including current display unit if optionsModel reference available. */
 QString RecentRequestsTableModel::getAmountTitle()
 {
-    return (this->walletModel->getOptionsModel() != nullptr) ? tr("Requested") + " ("+BitcoinUnits::name(this->walletModel->getOptionsModel()->getDisplayUnit()) + ")" : "";
+    return (this->walletModel->getOptionsModel() != nullptr) ? tr("Requested") + " ("+BitcoinUnits::shortName(this->walletModel->getOptionsModel()->getDisplayUnit()) + ")" : "";
 }
 
 QModelIndex RecentRequestsTableModel::index(int row, int column, const QModelIndex &parent) const