Add language validation & refactor config initialization

language-codes

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+aar
+abk
+ace
+ach
+ada
+ady
+afa
+afh
+afr
+ain
+aka
+akk
+alb
+ale
+alg
+alt
+ang
+amh
+anp
+apa
+ara
+arc
+arg
+arm
+arn
+arp
+art
+arw
+asm
+ast
+ath
+aus
+ava
+ave
+awa
+aym
+aze
+bad
+bai
+bak
+bal
+bam
+ban
+baq
+bas
+bat
+bej
+bel
+bem
+ben
+ber
+bho
+bih
+bik
+bin
+bis
+bla
+bnt
+bos
+bra
+bre
+btk
+bua
+bug
+bul
+bur
+byn
+cad
+cai
+car
+cat
+cau
+ceb
+cel
+cha
+chb
+che
+chg
+chi
+chk
+chm
+chn
+cho
+chp
+chr
+chu
+chv
+chy
+cmc
+cnr
+cop
+cor
+cos
+cpe
+cpf
+cpp
+cre
+crh
+crp
+csb
+cus
+cze
+dak
+dan
+dar
+day
+del
+den
+dgr
+din
+div
+doi
+dra
+dsb
+dua
+dum
+dut
+dyu
+dzo
+efi
+egy
+eka
+elx
+eng
+enm
+epo
+est
+ewe
+ewo
+fan
+fao
+fat
+fij
+fil
+fin
+fiu
+fon
+fre
+frm
+fro
+frr
+frs
+fry
+ful
+fur
+gaa
+gay
+gba
+gem
+geo
+ger
+gez
+gil
+gla
+gle
+glg
+glv
+gmh
+goh
+gon
+gor
+got
+grb
+grc
+gre
+grn
+gsw
+guj
+gwi
+hai
+hat
+hau
+haw
+heb
+her
+hil
+him
+hin
+hit
+hmn
+hmo
+hrv
+hsb
+hun
+hup
+iba
+ibo
+ice
+ido
+iii
+ijo
+iku
+ile
+ilo
+ina
+inc
+ind
+ine
+inh
+ipk
+ira
+iro
+ita
+jav
+jbo
+jpn
+jpr
+jrb
+kaa
+kab
+kac
+kal
+kam
+kan
+kar
+kas
+kau
+kaw
+kaz
+kbd
+kha
+khi
+khm
+kho
+kik
+kin
+kir
+kmb
+kok
+kom
+kon
+kor
+kos
+kpe
+krc
+krl
+kro
+kru
+kua
+kum
+kur
+kut
+lad
+lah
+lam
+lao
+lat
+lav
+lez
+lim
+lin
+lit
+lol
+loz
+ltz
+lua
+lub
+lug
+lui
+lun
+luo
+lus
+mac
+mad
+mag
+mah
+mai
+mak
+mal
+man
+mao
+map
+mar
+mas
+may
+mdf
+mdr
+men
+mga
+mic
+min
+mis
+mkh
+mlg
+mlt
+mnc
+mni
+mno
+moh
+mon
+mos
+mul
+mun
+mus
+mwl
+mwr
+myn
+myv
+nah
+nai
+nap
+nau
+nav
+nbl
+nde
+ndo
+nds
+nep
+new
+nia
+nic
+niu
+nno
+nob
+nog
+non
+nor
+nqo
+nso
+nub
+nwc
+nya
+nym
+nyn
+nyo
+nzi
+oci
+oji
+ori
+orm
+osa
+oss
+ota
+oto
+paa
+pag
+pal
+pam
+pan
+pap
+pau
+peo
+per
+phi
+phn
+pli
+pol
+pon
+por
+pra
+pro
+pus
+que
+raj
+rap
+rar
+roa
+roh
+rom
+rum
+run
+rup
+rus
+sad
+sag
+sah
+sai
+sal
+sam
+san
+sas
+sat
+scn
+sco
+sel
+sem
+sga
+sgn
+shn
+sid
+sin
+sio
+sit
+sla
+slo
+slv
+sma
+sme
+smi
+smj
+smn
+smo
+sms
+sna
+snd
+snk
+sog
+som
+son
+sot
+spa
+srd
+srn
+srp
+srr
+ssa
+ssw
+suk
+sun
+sus
+sux
+swa
+swe
+syc
+syr
+tah
+tai
+tam
+tat
+tel
+tem
+ter
+tet
+tgk
+tgl
+tha
+tib
+tig
+tir
+tiv
+tkl
+tlh
+tli
+tmh
+tog
+ton
+tpi
+tsi
+tsn
+tso
+tuk
+tum
+tup
+tur
+tut
+tvl
+twi
+tyv
+udm
+uga
+uig
+ukr
+umb
+und
+urd
+uzb
+vai
+ven
+vie
+vol
+vot
+wak
+wal
+war
+was
+wel
+wen
+wln
+wol
+xal
+xho
+yao
+yap
+yid
+yor
+ypk
+zap
+zbl
+zen
+zgh
+zha
+znd
+zul
+zun
+zxx
+zza
+OFF