This works and it is acceptable solution for now (of course, it would be great if it would work automatically in some manner)
My titles.toml:
[Programsko-Rjesenjes]
title = "Programska rješenja"
description = "Naša programska rješenja kreirana za vaše potrebe"
Here is the code in list.html
{{ .Scratch.Add "title" "" }}
{{ .Scratch.Add "description" "" }}
{{ if isset .Site.Data.titles .Title }}
{{ .Scratch.Set "title" (index .Site.Data.titles .Title).title }}
{{ .Scratch.Set "description" (index .Site.Data.titles .Title).description }}
{{ else }}
{{ .Scratch.Set "title" .Title}}
{{ .Scratch.Set "description" .Description}}
{{end}}
And it is used in HTML like this:
<h2 class="page-header-title" data-ix="page-title">{{ .Scratch.Get "title" }}</h2>
<h2 class="page-header-title description" data-ix="page-title-2">{{ .Scratch.Get "description" }}</h2>
Thanks for suggestion.