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the CA Legislature should make a law, declaring English as the official language of CA.

It already is, it's just that nobody notices. Here's an excerpt from California's constitution.

(a) Purpose.
English is the common language of the people of the United States of America and the State of California. This section is intended to preserve, protect and strengthen the English language, and not to supersede any of the rights guaranteed to the people by this Constitution.

(b) English as the Official Language of California.
English is the official language of the State of California.

(c) Enforcement.
The Legislature shall enforce this section by appropriate legislation. The Legislature and officials of the State of California shall take all steps necessary to insure that the role of English as the common language of the State of California is preserved and enhanced. The Legislature shall make no law which diminishes or ignores the role of English as the common language of the State of California.

snip

And now for a trip down memory lane...

California State Archives: California State Constitution [of] 1849

We, the people of California, grateful to Almighty God for our freedom, in order to secure its blessings, do establish this Constitution.

[Call the ACLU!!]

ARICLE XI
Sec. 21. All laws, decrees, regulations, and provisions, which from their nature require publication, shall be published in English and Spanish.