Improve library local source entry flags

[lalalasupa0]

Describe your suggested feature

Right now, when you add a local source entry to the library and you have all the badges turned on in the library settings, all the badges that entries from the local source have is a green text saying "Local source" and if anything by editing the language of the entry you could show a flag

But, I think it would be better if possible to be able to remove that local source text and to be able to change the flag to the one that entries from sources like Kemono have, which have "other" as language and that in the library the flag in question is shown, highlighting that it is not about a specific language; this cannot be done with local sources even when setting their languages to "other"

Other details

All this would help to be able to simulate a source entry to look like any from the usual sources, it would make it look nicer.

Acknowledgements

• I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open issue.
• I have written a short but informative title.
• If this is an request for a feature in the original Tachiyomi, I am opening because multiple versions of Yōkai have been released without this feature.
• If this is an issue with an extension, or a request for an extension, I should be contacting the extensions repository's maintainer/support for help.
• I have updated the app to version 1.9.7.
• I have checked through the app settings for my feature.
• I will fill out all of the requested information in this form.