Internationalisation of error messages

src/interfaces/jdbc/postgresql/Connection.java

src/interfaces/jdbc/postgresql/Driver.java

src/interfaces/jdbc/postgresql/Field.java

src/interfaces/jdbc/postgresql/PG_Stream.java

src/interfaces/jdbc/postgresql/errors.properties

src/interfaces/jdbc/postgresql/fastpath/Fastpath.java

src/interfaces/jdbc/postgresql/geometric/PGbox.java

src/interfaces/jdbc/postgresql/geometric/PGcircle.java

src/interfaces/jdbc/postgresql/geometric/PGline.java

src/interfaces/jdbc/postgresql/geometric/PGlseg.java

src/interfaces/jdbc/postgresql/geometric/PGpath.java

src/interfaces/jdbc/postgresql/geometric/PGpoint.java

src/interfaces/jdbc/postgresql/jdbc1/Connection.java

src/interfaces/jdbc/postgresql/jdbc1/PreparedStatement.java

src/interfaces/jdbc/postgresql/jdbc1/ResultSet.java

src/interfaces/jdbc/postgresql/jdbc1/ResultSetMetaData.java

src/interfaces/jdbc/postgresql/jdbc1/Statement.java

src/interfaces/jdbc/postgresql/jdbc2/Connection.java

src/interfaces/jdbc/postgresql/jdbc2/PreparedStatement.java

src/interfaces/jdbc/postgresql/jdbc2/ResultSet.java