This mod supports i18n translations. See the documentation for i18n translations with SMAPI:
https://stardewvalleywiki.com/Modding:Modder_Guide/APIs/Translation

Brief Overview:
In a working directory of your choice, create a folder structure as follows:
...\[CP] Baldurs Valley\i18n

Inside the i18n folder, create a copy of the default.json file and rename it with the title corresponding to the language you are translating to. See the documentation link for languages not listed.

Language | File name

Chinese | zh.json
French | fr.json
German | de.json
Hungarian | hu.json
Italian | it.json
Japanese | ja.json
Korean | ko.json
Portuguese | pt.json
Russian | ru.json
Spanish | es.json
Turkish | tr.json

Within your language translation json, you fill find all the mod's dialogue lines listed in key:value pairs.
They are given generically in the file as "Token":"Dialogue".
Translate the contents within the "Dialogue" values, leaving any symbols or command sequences between sentences.

After translating the dialogue, you can zip your translation [CP] Baldurs Valley folders (the main mod itself should not be here) and upload the translation to Nexus, noting the main mod as a requirement.

Moving the translation file into the Mods folder should seamlessly add your translation json into the existing i18n folder.

Thank you for translating!