mapSpain 0.5.0

• Rebuild coding database to avoid errors due to encoding.
• Fix translations on Galician.
• New grid functions (#61):
  • esp_get_grid_MTN()
  • esp_get_grid_BDN()
  • esp_get_grid_EEA()
  • esp_get_grid_ESDAC()

What's Changed

• Update pkgdown by @dieghernan in #60

Full Changelog: v0.4.0...v0.5.0