The frontend always stripped off the encodings already, so no point in
keeping that in the DB indices. The full locale was extracted from the
filename, which we still keep, so no information is list.
SQL "migration" script:
BEGIN;
CREATE INDEX files_tmp_locale ON files (locale);
INSERT INTO locales (locale) VALUES ('pl_PL'), ('is_IS'), ('ko_KR');
WITH obs(id, locale, lang) AS (
SELECT id, locale, regexp_replace(locale, '^([^.]+)\..+$', '\1') FROM locales WHERE locale LIKE '%.%'
UNION ALL
SELECT id, locale, '' FROM locales WHERE locale LIKE 'node%' OR locale = 'common'
), rep(old, new) AS (
SELECT o.id, x.id FROM obs o LEFT JOIN locales x ON x.locale = o.lang
), upd AS (
UPDATE files SET locale = new FROM rep WHERE locale = old
) DELETE FROM locales WHERE id IN(SELECT id FROM obs);
DROP INDEX files_tmp_locale;
COMMIT;
cd5d2c6a20