Added gettext libs and German translation to installer

Added the new and changed libraries needed for gettext. Removed old
copies of the libraries that are no longer needed or provided by
the new ones. Added the German translation file to the installer.

installer/mkvtoolnix-unicode.nsi

@@ -75,9 +75,9 @@ Section "Program files" SEC01
 
   SetOutPath "$INSTDIR"
   SetOverwrite ifnewer
-  File "libcharset.dll"
   File "libebml.dll"
-  File "libiconv.dll"
+  File "libiconv-2.dll"
+  File "libintl-8.dll"
   File "libmatroska.dll"
   File "magic1.dll"
   File "regex2.dll"
@@ -132,12 +132,17 @@ Section "Program files" SEC01
   File "examples\matroskachapters.dtd"
   File "examples\matroskasegmentinfo.dtd"
   File "examples\matroskatags.dtd"
+  SetOutPath "$INSTDIR\locale\german\LC_MESSAGES"
+  File "/oname=mkvtoolnix.mo" "po\de.mo"
 
   # Delete files that might be present from older installation
   # if this is just an upgrade.
   Delete "$INSTDIR\base64tool.exe"
   Delete "$INSTDIR\doc\base64tool.html"
   Delete "$INSTDIR\cygz.dll"
+  Delete "$INSTDIR\libcharset.dll"
+  Delete "$INSTDIR\libiconv.dll"
+
   DeleteRegKey HKLM "Software\Microsoft\Windows\CurrentVersion\App Paths\AppMainExe.exe"
   Delete "$SMPROGRAMS\$ICONS_GROUP\Documentation\Command line reference\base64tool CLI reference.lnk"
   SetShellVarContext current
@@ -293,6 +298,11 @@ Section Uninstall
   Delete "$INSTDIR\examples\matroskasegmentinfo.dtd"
   Delete "$INSTDIR\examples\matroskatags.dtd"
 
+  Delete "$INSTDIR\locale\german\LC_MESSAGES\mkvtoolnix.mo"
+
+  RMDir "$INSTDIR\locale\german\LC_MESSAGES"
+  RMDir "$INSTDIR\locale\german"
+  RMDir "$INSTDIR\locale"
   RMDir "$INSTDIR\data"
   RMDir "$INSTDIR\doc\images"
   RMDir "$INSTDIR\doc"