As a content editor, I want to be able to italicize words in the translation editor so that I can indicate which words are foreign (to the main language of the text)

[kseniaryzhova]

Testing notes (QA)

On the QA site:

• Add or edit a translation. In the text editor, you should see a button in the toolbar to italicize words.
• Save the translation. The italics should persist.
• Search for the document. In the search results, if an italicized word appears in the translation snippet, it should be italic—unless it's being highlighted because it matches a search term.
• Add or edit a transcription. In this case, there should not be an italic option, since transcriptions won't be italicized.

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Describe the solution you'd like
I want there to be an option to italicize words in the translation module because many translations come with italicized words that represent words in a language different to that of the main text.

This is a lower priority than design implementation.