Here the modified script:
#### Global variables
lang_id=2;
lang_desc='Francais';
char_set='utf8';
###char_set='koi8r';
###char_set='cp1251';
###char_set='cp866';
dbuser='root';
dbip='localhost';
#### End Global variables
### create language entry
mysql -u$dbuser -h$dbip -e "insert into \`pluto_main\`.\`Language\` (PK_Language, Description , psc_id) values ($lang_id ,\"$lang_desc\",$lang_id );"
mysql -u$dbuser -h$dbip -e "delete from pluto_main.Text_LS where FK_Language =$lang_id;"
### Read the first string id for english language
#! /bin/bash
while IFS=, read numero description
do
echo -e "insert ---- numero:$numero,description: $description\n"
#### insert the translated string back to DB
mysql -u$dbuser -h$dbip -e "insert into \`pluto_main\`.\`Text_LS\` (FK_Text,FK_Language,Description) values($numero,$lang_id,$description);" --default-character-set=$char_set
done < text_ls.csv
Philippe