iso-codes: upgrade 4.13.0 -> 4.15.0

Changelog:
==========
- Translation updates for ISO 3166-1
- Translation updates for ISO 3166-3
- Translation updates for ISO 639-2
- Translation updates for ISO 3166-1
- Translation updates for ISO 3166-2
- Translation updates for ISO 3166-3
- Translation updates for ISO 639-2
- Translation updates for ISO 639-3
- Translation updates for ISO 639-5
- Translation updates for ISO 4217
- Translation updates for ISO 15924
* ISO 3166-2: Fix wrong Spanish translation

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>