Remove unused French translations in Connect engine (#2252)

These files are currently not being used nor compiled in MariaDB. The use of large lists of 'case' statements in these source files are also not a great way to represent translated strings. This git history can be referred to when a better translation interface can be implemented in the future. Therefore, these files can be removed to cleanup the MariaDB codebase. All new code of the whole pull request, including one or several files that are either new files or modified ones, are contributed under the BSD-new license. I am contributing on behalf of my employer Amazon Web Services, Inc.

Author: anson1014

storage/connect/frcas.h

@@ -540,11 +540,7 @@ extern "C" const char *msglang(void)
 #else // !XMSG && !NEWMSG
 extern "C" const char *msglang(void)
 {
-#if defined(FRENCH)
- return "french";
-#else // DEFAULT
  return "english";
-#endif // DEFAULT
 } // end of msglang
 #endif // !XMSG && !NEWMSG
 

storage/connect/frids.h

@@ -1,13 +1,5 @@
 /**************************************************************************/
 /* NLS messsages definition. */
 /**************************************************************************/
-#if defined(FRENCH)
-#if defined(CPX)
-#include "frmsg1.h"
-#else /* not CPX */
-#include "frmsg2.h"
-#endif /* CPX */
-#else /* not FRENCH */
 #include "engmsg.h"
-#endif /* FRENCH */
 /* ---------------------------------------------------------------------- */

storage/connect/frmsg.h

@@ -14,11 +14,7 @@
 /***********************************************************************/
 /* DB Constant definitions. */
 /***********************************************************************/
-#if defined(FRENCH)
-#define DEFAULT_LOCALE "French"
-#else // !FRENCH
 #define DEFAULT_LOCALE "English"
-#endif // !FRENCH
 
 #define DOS_MAX_PATH 144 /* Must be the same across systems */
 #define DOS_BUFF_LEN 100 /* Number of lines in binary file buffer */

storage/connect/frmsg1.h

@@ -32,17 +32,6 @@ const char *GetMsgid(int id)
  const char *p = NULL;
 
  // This conditional until a real fix is found for MDEV-7304
-#if defined(FRENCH)
- if (!stricmp(msglang(), "french"))
- switch (id) {
-#include "frids.h"
-#if defined(NEWMSG)
-#include "frcas.h"
-#endif // NEWMSG
- } // endswitch(id)
-
- else // English
-#endif // FRENCH
  switch (id) {
 #include "enids.h"
 #if defined(NEWMSG)