Indicative mood for all verbs in command and effect descriptions...

... Some of them have no verb.

include/audacity/IdentInterface.h

@@ -69,6 +69,7 @@ public:
    virtual wxString GetVersion() = 0;
 
    // This returns a translated string
+   // Any verb should be present tense indicative, not imperative
    virtual wxString GetDescription() = 0;
 
    // non-virtual convenience function

src/commands/OpenSaveCommands.h

@@ -28,7 +28,7 @@ class OpenProjectCommand : public AudacityCommand
 public:
    // CommandDefinitionInterface overrides
    wxString GetSymbol() override {return OPEN_PROJECT_PLUGIN_SYMBOL;};
-   wxString GetDescription() override {return _("Open a project.");};
+   wxString GetDescription() override {return _("Opens a project.");};
    bool DefineParams( ShuttleParams & S ) override;
    void PopulateOrExchange(ShuttleGui & S) override;
    bool Apply(const CommandContext & context) override;
@@ -61,4 +61,4 @@ public:
    bool mbCompress;
    bool bHasAddToHistory;
    bool bHasCompress;
-};
+};

src/effects/ChangePitch.cpp

@@ -122,7 +122,7 @@ wxString EffectChangePitch::GetSymbol()
 
 wxString EffectChangePitch::GetDescription()
 {
-   return _("Change the pitch of a track without changing its tempo");
+   return _("Changes the pitch of a track without changing its tempo");
 }
 
 wxString EffectChangePitch::ManualPage()

src/effects/ChangeSpeed.cpp

@@ -112,7 +112,7 @@ wxString EffectChangeSpeed::GetSymbol()
 
 wxString EffectChangeSpeed::GetDescription()
 {
-   return _("Change the speed of a track, also changing its pitch");
+   return _("Changes the speed of a track, also changing its pitch");
 }
 
 wxString EffectChangeSpeed::ManualPage()

src/effects/ChangeTempo.cpp

@@ -99,7 +99,7 @@ wxString EffectChangeTempo::GetSymbol()
 
 wxString EffectChangeTempo::GetDescription()
 {
-   return _("Change the tempo of a selection without changing its pitch");
+   return _("Changes the tempo of a selection without changing its pitch");
 }
 
 wxString EffectChangeTempo::ManualPage()

src/effects/Paulstretch.cpp

@@ -105,7 +105,7 @@ wxString EffectPaulstretch::GetSymbol()
 
 wxString EffectPaulstretch::GetDescription()
 {
-   return _("Use Paulstretch only for an extreme time-stretch or \"stasis\" effect");
+   return _("Paulstretch is only for an extreme time-stretch or \"stasis\" effect");
 }
 
 wxString EffectPaulstretch::ManualPage()