Small cleanup

Removed unused key TP_FILMNEGATIVE_REF_SPOTS.

Style fix in language string.

generateTranslationDiffs

Film Negative values in History use newlines to reduce required width.

Removed benchmark code.

rtengine/filmnegativeproc.cc

@@ -175,7 +175,7 @@ void rtengine::RawImageSource::filmNegativeProcess(const procparams::FilmNegativ
         static_cast<float>(-params.greenExp),
         static_cast<float>(-params.blueRatio * params.greenExp)
     };
-    
+
     MyTime t1, t2, t3,t4, t5;
 
     t1.set();

rtengine/filmnegativethumb.cc

@@ -41,7 +41,6 @@ void rtengine::Thumbnail::processFilmNegative(
     const int rwidth, const int rheight,
     float &rmi, float &gmi, float &bmi
 ) {
-    StopWatch stop1("Thumbnail film negative", true);
 
     // Channel exponents
     const float rexp = -params.filmNegative.redRatio * params.filmNegative.greenExp;
@@ -128,4 +127,4 @@ void rtengine::Thumbnail::processFilmNegative(
             bline[j] = CLIP(bmult * pow_F(bline[j], bexp));
         }
     }
-}
+}