Translate German variable names in Calc (financial)

These names of variables correspond to German function names in Calc and were
translated to their English equivalents. For used translations, see, e.g.,
https://translations.documentfoundation.org/de/libo54_help/translate/#search=RMZ&sfields=target&soptions=exact,case

Note: The translation here is equal to the translation of variables done
on https://gerrit.libreoffice.org/43078 , etc.

Change-Id: I1010a3ddf58a0d32e97bfb55090dc7aacc0b91b7
Reviewed-on: https://gerrit.libreoffice.org/43692Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Eike Rathke <erack@redhat.com>

scaddins/source/analysis/analysishelper.cxx

@@ -1231,39 +1231,39 @@ double GetOddlyield( sal_Int32 nNullDate, sal_Int32 nSettle, sal_Int32 nMat, sal
 }
 
 
-double GetRmz( double fZins, double fZzr, double fBw, double fZw, sal_Int32 nF )
+double GetRmz( double fInterest, double fNper, double fPv, double fFv, sal_Int32 nPayType )
 {
-    double      fRmz;
-    if( fZins == 0.0 )
-        fRmz = ( fBw + fZw ) / fZzr;
+    double      fPmt;
+    if( fInterest == 0.0 )
+        fPmt = ( fPv + fFv ) / fNper;
     else
     {
-        double  fTerm = pow( 1.0 + fZins, fZzr );
-        if( nF > 0 )
-            fRmz = ( fZw * fZins / ( fTerm - 1.0 ) + fBw * fZins / ( 1.0 - 1.0 / fTerm ) ) / ( 1.0 + fZins );
+        double  fTerm = pow( 1.0 + fInterest, fNper );
+        if( nPayType > 0 )
+            fPmt = ( fFv * fInterest / ( fTerm - 1.0 ) + fPv * fInterest / ( 1.0 - 1.0 / fTerm ) ) / ( 1.0 + fInterest );
         else
-            fRmz = fZw * fZins / ( fTerm - 1.0 ) + fBw * fZins / ( 1.0 - 1.0 / fTerm );
+            fPmt = fFv * fInterest / ( fTerm - 1.0 ) + fPv * fInterest / ( 1.0 - 1.0 / fTerm );
     }
 
-    return -fRmz;
+    return -fPmt;
 }
 
 
-double GetZw( double fZins, double fZzr, double fRmz, double fBw, sal_Int32 nF )
+double GetZw( double fInterest, double fNper, double fPmt, double fPv, sal_Int32 nPayType )
 {
-    double      fZw;
-    if( fZins == 0.0 )
-        fZw = fBw + fRmz * fZzr;
+    double      fFv;
+    if( fInterest == 0.0 )
+        fFv = fPv + fPmt * fNper;
     else
     {
-        double  fTerm = pow( 1.0 + fZins, fZzr );
-        if( nF > 0 )
-            fZw = fBw * fTerm + fRmz * ( 1.0 + fZins ) * ( fTerm - 1.0 ) / fZins;
+        double  fTerm = pow( 1.0 + fInterest, fNper );
+        if( nPayType > 0 )
+            fFv = fPv * fTerm + fPmt * ( 1.0 + fInterest ) * ( fTerm - 1.0 ) / fInterest;
         else
-            fZw = fBw * fTerm + fRmz * ( fTerm - 1.0 ) / fZins;
+            fFv = fPv * fTerm + fPmt * ( fTerm - 1.0 ) / fInterest;
     }
 
-    return -fZw;
+    return -fFv;
 }
 
 // financial functions COUP***

scaddins/source/analysis/analysishelper.hxx

@@ -155,8 +155,8 @@ double              GetOddlprice( sal_Int32 nNullDate, sal_Int32 nSettle, sal_In
 /// @throws css::lang::IllegalArgumentException
 double              GetOddlyield( sal_Int32 nNullDate, sal_Int32 nSettle, sal_Int32 nMat, sal_Int32 nLastInterest,
                                 double fRate, double fPrice, double fRedemp, sal_Int32 nFreq, sal_Int32 nBase );
-double              GetRmz( double fZins, double fZzr, double fBw, double fZw, sal_Int32 nF );
-double              GetZw( double fZins, double fZzr, double fRmz, double fBw, sal_Int32 nF );
+double              GetRmz( double fInterest, double fNper, double fPv, double fFv, sal_Int32 nPayType );
+double              GetZw( double fInterest, double fNper, double fPmt, double fPv, sal_Int32 nPayType );
 
 /// @throws css::uno::RuntimeException
 /// @throws css::lang::IllegalArgumentException