Convert all wxTRANSLATE() to XO()

XO() can be used anywhere a string must be extracted for translation
but not automatically translated at runtime.

src/effects/Repair.cpp

@@ -50,7 +50,7 @@ wxString EffectRepair::GetSymbol()
 
 wxString EffectRepair::GetDescription()
 {
-   return wxTRANSLATE("Sets the peak amplitude of a one or more tracks");
+   return XO("Sets the peak amplitude of a one or more tracks");
 }
 
 // EffectIdentInterface implementation