Issues:
- if we change english string in code we are changing the key in all locales and that require re-translation everywhere
- ngx-translate-extract
- marker must be imported by exact path: "@biesbjerg/ngx-translate-extract-marker"
- it may broke if uncompilable version of TS used in project
- it extracts from comments too
Useful links: https://unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html http://userguide.icu-project.org/formatparse/messages https://messageformat.github.io/messageformat/page-guide