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=GDA&sfields=target&soptions=exact,case

Change-Id: I58be84b37e045ac15bcdf15032def7591be53de7
Reviewed-on: https://gerrit.libreoffice.org/43078Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Eike Rathke <erack@redhat.com>

sc/source/core/tool/interpr2.cxx

@@ -1647,7 +1647,7 @@ void ScInterpreter::ScSYD()
 double ScInterpreter::ScGetGDA(double fValue, double fRest, double fTimeLength,
                 double fPeriod, double fFactor)
 {
-    double fGda, fInterest, fOldValue, fNewValue;
+    double fDdb, fInterest, fOldValue, fNewValue;
     fInterest = fFactor / fTimeLength;
     if (fInterest >= 1.0)
     {
@@ -1662,12 +1662,12 @@ double ScInterpreter::ScGetGDA(double fValue, double fRest, double fTimeLength,
     fNewValue = fValue * pow(1.0 - fInterest, fPeriod);
 
     if (fNewValue < fRest)
-        fGda = fOldValue - fRest;
+        fDdb = fOldValue - fRest;
     else
-        fGda = fOldValue - fNewValue;
-    if (fGda < 0.0)
-        fGda = 0.0;
-    return fGda;
+        fDdb = fOldValue - fNewValue;
+    if (fDdb < 0.0)
+        fDdb = 0.0;
+    return fDdb;
 }
 
 void ScInterpreter::ScDDB()
@@ -1718,9 +1718,9 @@ void ScInterpreter::ScDB()
     double nOffRate = 1.0 - pow(nRest / nValue, 1.0 / nTimeLength);
     nOffRate = ::rtl::math::approxFloor((nOffRate * 1000.0) + 0.5) / 1000.0;
     double nFirstOffRate = nValue * nOffRate * nMonths / 12.0;
-    double nGda2 = 0.0;
+    double nDb = 0.0;
     if (::rtl::math::approxFloor(nPeriod) == 1)
-        nGda2 = nFirstOffRate;
+        nDb = nFirstOffRate;
     else
     {
         double nSumOffRate = nFirstOffRate;
@@ -1729,13 +1729,13 @@ void ScInterpreter::ScDB()
         sal_uInt16 iMax = (sal_uInt16)::rtl::math::approxFloor(nMin);
         for (sal_uInt16 i = 2; i <= iMax; i++)
         {
-            nGda2 = (nValue - nSumOffRate) * nOffRate;
-            nSumOffRate += nGda2;
+            nDb = (nValue - nSumOffRate) * nOffRate;
+            nSumOffRate += nDb;
         }
         if (nPeriod > nTimeLength)
-            nGda2 = ((nValue - nSumOffRate) * nOffRate * (12.0 - nMonths)) / 12.0;
+            nDb = ((nValue - nSumOffRate) * nOffRate * (12.0 - nMonths)) / 12.0;
     }
-    PushDouble(nGda2);
+    PushDouble(nDb);
 }
 
 double ScInterpreter::ScInterVDB(double fValue,double fRest,double fTimeLength,
@@ -1745,34 +1745,34 @@ double ScInterpreter::ScInterVDB(double fValue,double fRest,double fTimeLength,
     double fIntEnd   = ::rtl::math::approxCeil(fPeriod);
     sal_uLong nLoopEnd   = (sal_uLong) fIntEnd;
 
-    double fTerm, fLia;
+    double fTerm, fSln; // SLN: Straight-Line Depreciation
     double fSalvageValue = fValue - fRest;
-    bool bNowLia = false;
+    bool bNowSln = false;
 
-    double fGda;
+    double fDdb;
     sal_uLong i;
-    fLia=0;
+    fSln=0;
     for ( i = 1; i <= nLoopEnd; i++)
     {
-        if(!bNowLia)
+        if(!bNowSln)
         {
-            fGda = ScGetGDA(fValue, fRest, fTimeLength, (double) i, fFactor);
-            fLia = fSalvageValue/ (fTimeLength1 - (double) (i-1));
+            fDdb = ScGetGDA(fValue, fRest, fTimeLength, (double) i, fFactor);
+            fSln = fSalvageValue/ (fTimeLength1 - (double) (i-1));
 
-            if (fLia > fGda)
+            if (fSln > fDdb)
             {
-                fTerm = fLia;
-                bNowLia = true;
+                fTerm = fSln;
+                bNowSln = true;
             }
             else
             {
-                fTerm = fGda;
-                fSalvageValue -= fGda;
+                fTerm = fDdb;
+                fSalvageValue -= fDdb;
             }
         }
         else
         {
-            fTerm = fLia;
+            fTerm = fSln;
         }
 
         if ( i == nLoopEnd)