Fixed some smart quotes that can cause problems for .po file generation.

src/BatchProcessDialog.cpp

@@ -686,7 +686,7 @@ void EditChainsDialog::OnAdd(wxCommandEvent &event)
 
       if (name.Contains(wxFILE_SEP_PATH) ||
           name.Contains(wxFILE_SEP_PATH_UNIX)) {
-         /*i18n-hint: The %c will be replaced with ‘forbidden characters’, like ‘/’ and ‘\’.*/
+         /*i18n-hint: The %c will be replaced with 'forbidden characters', like '/' and '\'.*/
          wxMessageBox(wxString::Format(_("Names may not contain '%c' and '%c'"),
                       wxFILE_SEP_PATH, wxFILE_SEP_PATH_UNIX),
                       GetTitle(),

src/FreqWindow.cpp

@@ -867,7 +867,7 @@ void FreqWindow::PlotPaint(wxPaintEvent & evt)
          peakpitch = PitchName_Absolute(FreqToMIDInoteNumber(bestpeak));
          xp = xpitch.c_str();
          pp = peakpitch.c_str();
-         /* i18n-hint: The %d’s are replaced by numbers, the %s by musical notes, e.g. A#*/
+         /* i18n-hint: The %d's are replaced by numbers, the %s by musical notes, e.g. A#*/
          info.Printf(_("Cursor: %d Hz (%s) = %d dB    Peak: %d Hz (%s) = %.1f dB"),
                int (xPos + 0.5), xp,
                int (value + 0.5), int (bestpeak + 0.5),
@@ -877,7 +877,7 @@ void FreqWindow::PlotPaint(wxPaintEvent & evt)
          peakpitch = PitchName_Absolute(FreqToMIDInoteNumber(1.0 / bestpeak));
          xp = xpitch.c_str();
          pp = peakpitch.c_str();
-         /* i18n-hint: The %d’s are replaced by numbers, the %s by musical notes, e.g. A#
+         /* i18n-hint: The %d's are replaced by numbers, the %s by musical notes, e.g. A#
           * the %.4f are numbers, and 'sec' should be an abbreviation for seconds */
          info.Printf(_("Cursor: %.4f sec (%d Hz) (%s) = %f,    Peak: %.4f sec (%d Hz) (%s) = %.3f"),
                      xPos,

src/HelpText.cpp

@@ -181,7 +181,7 @@ wxString HelpTextBuiltIn( const wxString & Key )
 {
    if(Key==wxT("welcome"))
    {
-      /* i18n-hint: Preserve [[file:quick_help.html as it’s the name of a file.*/
+      /* i18n-hint: Preserve [[file:quick_help.html as it's the name of a file.*/
       return WrapText(
          wxString(wxT("")) +
          _("<center><h3>How to Get Help</h3></center>") +

src/LangChoice.cpp

@@ -124,7 +124,7 @@ void LangChoiceDialog::OnOk(wxCommandEvent & event)
    
    if (mLang.Left(2) != slang.Left(2)) {
       wxString msg;
-      /* i18n-hint; The %s’s are replaced by translated and untranslated 
+      /* i18n-hint; The %s's are replaced by translated and untranslated 
        * versions of language names. */
       msg.Printf(_("The language you have chosen, %s (%s), is not the same as the system language, %s (%s)."),
                  mLangNames[ndx].c_str(),

src/effects/AutoDuck.cpp

@@ -139,9 +139,9 @@ bool EffectAutoDuck::Init()
          {
             wxMessageBox(
                _("You selected a track which does not contain audio. AutoDuck can only process audio tracks."),
-               /* i18n-hint: Auto duck is the name of an effect that ‘ducks’ (reduces the volume) 
+               /* i18n-hint: Auto duck is the name of an effect that 'ducks' (reduces the volume) 
                 * of the audio automatically when there is sound on another track.  Not as 
-                * in ‘Donald-Duck’!*/
+                * in 'Donald-Duck'!*/
                _("Auto Duck"), wxICON_ERROR, mParent);
             return false;
          }

src/effects/ChangeSpeed.cpp

@@ -311,7 +311,7 @@ END_EVENT_TABLE()
 
 ChangeSpeedDialog::ChangeSpeedDialog(EffectChangeSpeed *effect, wxWindow *parent)
 :  EffectDialog(parent, 
-   /* i18n-hint: Audacity’s change speed effect changes the speed and pitch.*/
+   /* i18n-hint: Audacity's change speed effect changes the speed and pitch.*/
    _("Change Speed"), 
    PROCESS_EFFECT),
    mEffect(effect)

src/effects/Compressor.cpp

@@ -654,7 +654,7 @@ void CompressorDialog::PopulateOrExchange(ShuttleGui & S)
                                              wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL);
 
          /* i18n-hint: Particularly in percussion, sounds can be regarded as having 
-          * an ‘attack’ phase where the sound builds up and a ‘decay’ where the 
+          * an 'attack' phase where the sound builds up and a 'decay' where the 
           * sound dies away.  So this means 'onset duration'.  */
          mAttackLabel = S.AddVariableText(_("Attack Time:"), true,
                                          wxALIGN_RIGHT | wxALIGN_CENTER_VERTICAL);

src/toolbars/SelectionBar.cpp

@@ -228,8 +228,8 @@ void SelectionBar::Populate()
                                    wxLI_VERTICAL),
                   0,  wxRIGHT, 5);
    /* i18n-hint: The snap-to mode, when enabled, means for example that selections 
-    * are always at whole second boundaries.  You can’t select a range 4.5s to 7.9s 
+    * are always at whole second boundaries.  You can't select a range 4.5s to 7.9s 
-    * because the boundaries ‘snap to’ the nearest whole number.*/
+    * because the boundaries 'snap to' the nearest whole number.*/
    mSnapTo = new wxCheckBox(this, OnSnapToID, _("Snap To"),
                             wxDefaultPosition, wxDefaultSize,
                             wxALIGN_RIGHT);

src/xml/XMLWriter.cpp

@@ -345,7 +345,7 @@ void XMLFileWriter::CloseWithoutEndingTags()
    if (!wxFFile::Flush())
    {
       wxFFile::Close();
-      /* i18n-hint: ’flushing’ means writing any remaining queued up changes 
+      /* i18n-hint: 'flushing' means writing any remaining queued up changes 
        * to disk that have not yet been written.*/
       throw new XMLFileWriterException(_("Error Flushing File"));
    }