Adding images lexiqa

[jesgreco]

Adding images and explanation under "Finding a string to translate" section to make a QA Test by using the LexiQA feature integrated with Transifex.

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[feanil]

Looks good with the conflict resolved and I'm gonna merge this for now but long term does it make sense to move the lexiqa instructions in to a separate "How-To" and cross-link between the one for translating for transifex and translating for the openedx website?

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