feat: Change return observable as in original

[EndyKaufman]

core/libs/rucken/core/src/lib/pipes/custom-translate.pipe.ts

Line 4 in 4dd05fd

@Pipe({ name: 'customTranslate' })

https://github.com/ngx-translate/core/blob/master/projects/ngx-translate/core/src/lib/translate.pipe.ts