check-spell-ec: ignore source words

Adrian Chaves requested to merge spellcheck-ignore-source-words into master

I am proposing to force this behavior, however I would like feedback from people using this sieve. Would everyone be OK with ignoring words that exist in the original string? (which I believe is what Lokalize does)

Alternatively, I would expose this as a setting, and even keep the old behavior by default. In that case, however, it would be nice if someone could help me understand how I can make this setting discoverable in, if at all possible (I am not sure if those docs were generated once and are frozen now, or are actually updated from the sources).

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