i18n: Add comments and improve source strings

Source/Core/DolphinQt/Debugger/AssemblerWidget.cpp

@@ -729,9 +729,7 @@ void AssemblerWidget::NewEditor(const QString& path)
   if (!path.isEmpty() && !new_editor->LoadFromPath())
   {
     ModalMessageBox::warning(this, tr("Failed to open file"),
-                             tr("Failed to read the contents of file\n\n"
-                                "\"%1\"")
-                                 .arg(path));
+                             tr("Failed to read the contents of file:\n%1").arg(path));
     delete new_editor;
     return;
   }

Source/Core/DolphinQt/Debugger/BranchWatchDialog.cpp

@@ -757,6 +757,8 @@ void BranchWatchDialog::OnToggleAutoSave(bool checked)
     return;
 
   const QString filepath = DolphinFileDialog::getSaveFileName(
+      // i18n: If the user selects a file, Branch Watch will save to that file.
+      // If the user presses Cancel, Branch Watch will save to a file in the user folder.
       this, tr("Select Branch Watch snapshot auto-save file (for user folder location, cancel)"),
       QString::fromStdString(File::GetUserPath(D_DUMPDEBUG_BRANCHWATCH_IDX)),
       tr("Text file (*.txt);;All Files (*)"));

Source/Core/DolphinQt/Debugger/MemoryWidget.cpp

@@ -200,6 +200,7 @@ void MemoryWidget::CreateWidgets()
   m_display_combo->addItem(tr("Double"), int(Type::Double));
 
   m_align_combo = new QComboBox;
+  // i18n: "Fixed" here means that the alignment is always the same
   m_align_combo->addItem(tr("Fixed Alignment"));
   m_align_combo->addItem(tr("Type-based Alignment"), 0);
   m_align_combo->addItem(tr("No Alignment"), 1);