nsis: improve wording

extras/package/win32/NSIS/vlc.win32.nsi.in

@@ -429,7 +429,7 @@ ${MementoSectionRestore}
 
 @HAVE_WIN64_TRUE@ !include "x64.nsh"
 @HAVE_WIN64_TRUE@ ${Unless} ${RunningX64}
-@HAVE_WIN64_TRUE@    MessageBox MB_OK|MB_ICONSTOP "This version of VLC only runs on 64bits operating systems.$\nYour operating system is 32bits.$\n$\nPlease get the 32 BITS version."
+@HAVE_WIN64_TRUE@    MessageBox MB_OK|MB_ICONSTOP "This version of VLC only runs on 64-bit operating systems.$\nPlease get the 32-bit version and try again."
 @HAVE_WIN64_TRUE@    Quit
 @HAVE_WIN64_TRUE@ ${EndUnless}
 ${If} ${AtLeastWinXP}
@@ -454,11 +454,11 @@ UAC_Elevate:
     Quit
 
 UAC_Err:
-    MessageBox mb_iconstop "Unable to elevate, error $0"
+    MessageBox mb_iconstop "Unable to elevate, error $0$\nPlease try to run this installer with admin privileges."
     Abort
 
 UAC_ElevationAborted:
-    MessageBox mb_iconstop "This installer requires admin access, aborting!"
+    MessageBox mb_iconstop "This installer requires admin privileges, aborting!"
     Abort
 
 WinTooOld:
@@ -468,7 +468,7 @@ WinTooOld:
 UAC_Success:
     StrCmp 1 $3 +4
     StrCmp 3 $1 0 UAC_ElevationAborted
-    MessageBox mb_iconstop "This installer requires admin access, try again"
+    MessageBox mb_iconstop "This installer requires admin privileges, try again."
     goto UAC_Elevate
 
   ; /update argument