Fix deprecation warnings emitted from hugo 0.158.0

[deining]

When running the site with latest released hugo version 0.158.0, deprecation warnings are printed out:

INFO  deprecated: project config key languages.en.languageName was deprecated in Hugo v0.158.0 and will be removed in a future release. Use languages.en.label instead.
INFO  deprecated: project config key languages.no.languageName was deprecated in Hugo v0.158.0 and will be removed in a future release. Use languages.no.label instead.
INFO  deprecated: project config key languages.fa.languageName was deprecated in Hugo v0.158.0 and will be removed in a future release. Use languages.fa.label instead.
INFO  deprecated: project config key languages.fa.languageDirection was deprecated in Hugo v0.158.0 and will be removed in a future release. Use languages.fa.direction instead.
INFO  deprecated: project config key languages.no.languageName was deprecated in Hugo v0.158.0 and will be removed in a future release. Use languages.no.label instead.
INFO  deprecated: project config key languages.fa.languageName was deprecated in Hugo v0.158.0 and will be removed in a future release. Use languages.fa.label instead.
INFO  deprecated: project config key languages.fa.languageDirection was deprecated in Hugo v0.158.0 and will be removed in a future release. Use languages.fa.direction instead.
INFO  deprecated: project config key languages.en.languageName was deprecated in Hugo v0.158.0 and will be removed in a future release. Use languages.en.label instead.

See: https://discourse.gohugo.io/t/deprecations-in-v0-158-0/56869

This PR fixes these warnings.