Need help with the translation [2021-09]

Good morning everyone. Since I don’t have an answer to the clarification request. I am asking my questions here.

  1. What [i:circle_8] means? On this depends if my translation will be before this phrase or after.
    https://translations.roonlabs.net/lang/polish/e065ba6352dd8231047764af7f1d0331

  2. What {catalog_numbering_system} means? On this depends whether my translation will be before this phrase or after.
    https://translations.roonlabs.net/lang/polish/00498829fd83125d9bfad14478348c5f

  3. What {library_count}} means? It depends on this whether my translation will be before this phrase or after.
    https://translations.roonlabs.net/lang/polish/dec6bbc2aea90fcca7c87e8fef24dd46

  4. How to add space at the beginning of translation? When I type it and save the translation, the space disappears.

Thanks, Tom

For 1. 2. 3. I answered in the tool, your translations look good.
You can’t add a space at the beginning of a translation but to my experience it’s never needed.