Kupenda means TO LIKE as well as TO LOVE. DL doesn't accept to love in this context.
Is there really a significant difference in English between "I like a language" and "I love a language"? I ask because I'm not a native speaker of English.
Swahili is a word that can be used to refer to the language, food, and people. Just as English can be used in reference to people, or the language. I guess [the], and [language] are used in the translation for emphasis, and to avoid confusion.