Decimal notation using comma instead of dot messes up installation.

My drupal installation has two languages English and Greek, with Greek being the main language. When trying to install the weather module I got a "columns do not match values count" error while the weather-data.inc was getting executed. I noticed that the insert statements had become

db_query("INSERT INTO {weather_icao} (icao, country, name, latitude, longitude) VALUES ('%s', '%s', '%s', %f, %f)", 'LGPZ', 'Greece', 'Aktion Airport', 38,616667, 20,766667);
instead of
db_query("INSERT INTO {weather_icao} (icao, country, name, latitude, longitude) VALUES ('%s', '%s', '%s', %f, %f)", 'LGPZ', 'Greece', 'Aktion Airport', 38.616667, 20.766667);
possibly due to the different decimal notation.
Switching the site language to English fixed the error and installation completed fine.
I just thought of posting this here in case anyone else runs on this problem as it made me head scratching like mad.