docs: Add Cloud Code tags for API Explorer pilot

[abbycar]

This adds region tags in order to support the upcoming Cloud Code API Explorer pilot

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• samples/v3/translate_translate_text.js:30, tag translate_v3_translate_text_0
• samples/v3/translate_translate_text.js:35, tag translate_v3_translate_text_1
• samples/v3/translate_translate_text.js:41, tag translate_v3_translate_text_2
• samples/v3/translate_translate_text.js:52, tag translate_v3_translate_text_3

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