The following languages in layouttranslation file are used, yet they haven't
been reviewed by native speaker and we should ask for checking the list any
time (new) translator appears with .po update.

(29.4.2011, LyX 2.0.0 release) 

bg
ca
gl
ko
ru (Acknowledgement string issue only)
sl
tr


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(8.4.2014, LyX 2.1.0 release)

Additionally to the top ones, these languages should be reviewed for the following strings:
"Property"
"Solution"
"Listing"
"Listings"

eu
hu
id
ro
sr

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(30.11.2017, LyX 2.3.0 release )
Additionally to the top ones, these languages should be reviewed for the following strings
"List of Listings"
ar bg ca da el en es eu fi gl he hu ia id ko nb nl nn pl pt_BR pt_PT ro ru sk sl sr sv tr uk zh_CN zh_TW
"Nomenclature[[output]]" -> The string that is output to PDF for the nomenclature list
ar bg ca cs el eu fi gl he hu ia id ja ko nb nl nn pl ro sk sl sr sv tr wa zh_CN zh_TW
"see equation[[nomencl]]"
ar bg ca cs el eu fi gl he hu ia id ja ko nb nl nn pl ro sk sl sr sv tr wa zh_CN zh_TW
"page[[nomencl]]"
ar bg ca cs el eu fi gl he hu ia id ja ko nb nl nn pl ro sk sl sr sv tr wa zh_CN zh_TW