yuzu/main: Make error messages within OnCoreError more localization-friendly

Previously, a translated string was being appended onto another string
in a manner that doesn't allow the translator to control where the
appended text is placed. This can be a nuisance for languages where
grammar and text ordering differs from English.

We now append the strings via the format strings themselves, which
allows translators to reorder where the text will be placed.

src/yuzu/main.cpp

@@ -1843,13 +1843,14 @@ void GMainWindow::OnCoreError(Core::System::ResultStatus result, std::string det
            "data, or other bugs.");
     switch (result) {
     case Core::System::ResultStatus::ErrorSystemFiles: {
-        QString message = tr("yuzu was unable to locate a Switch system archive");
-        if (!details.empty()) {
-            message.append(tr(": %1. ").arg(QString::fromStdString(details)));
+        QString message;
+        if (details.empty()) {
+            message =
+                tr("yuzu was unable to locate a Switch system archive. %1").arg(common_message);
         } else {
-            message.append(tr(". "));
+            message = tr("yuzu was unable to locate a Switch system archive: %1. %2")
+                          .arg(QString::fromStdString(details), common_message);
         }
-        message.append(common_message);
 
         answer = QMessageBox::question(this, tr("System Archive Not Found"), message,
                                        QMessageBox::Yes | QMessageBox::No, QMessageBox::No);
@@ -1858,8 +1859,8 @@ void GMainWindow::OnCoreError(Core::System::ResultStatus result, std::string det
     }
 
     case Core::System::ResultStatus::ErrorSharedFont: {
-        QString message = tr("yuzu was unable to locate the Switch shared fonts. ");
-        message.append(common_message);
+        const QString message =
+            tr("yuzu was unable to locate the Switch shared fonts. %1").arg(common_message);
         answer = QMessageBox::question(this, tr("Shared Fonts Not Found"), message,
                                        QMessageBox::Yes | QMessageBox::No, QMessageBox::No);
         status_message = tr("Shared Font Missing");