Database schema internationalization, step 1

Translate database schema (table and column names)
into English.

Step 1:
- translate the dns.domain (old: dns.domaine) table
    and column names
- translate domain parameter in CGI forms and %...% holes
- provides the infrastructure to ease such modifications:
    - database creation is splitted into 4 files:
	.../lib/sql22/schema-main.sql: create schema and tables
	    for all schemas but the MAC schema
	.../lib/sql22/schema-mac.sql: create MAC schema and tables
	.../lib/sql22/functions.sql: create all functions
	.../lib/sql22/triggers.sql: create all triggers
    - links in .../lib/*.sql are provided such as netmagis-dbcreate
	can call  these files
    - the upgrade script (.../share/exampes/upgrade/21-22/upgrade.sql)
	destroys functions and triggers, then upgrades tables and
	finally calls the .../lib/sql22/{functions,triggers}.sql files
    => this way, the function/trigger creation logic is located in only
	one place (and the table creation logic is in a single file,
	not mixed with the netmagis-dbcreate shell programm)

While we are here, fix a few translations in
common/msgs/fr.msg