Manual marking of words in frequency list

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Current progress

Features

• When unknown word is clicked, it is set to known by setting the modifier to 0
• When known word is clicked, it is set to unknown by setting the modifier such that current score is half of threshold
• When word with existing modifier is clicked, the modifier is removed
• Unknown words will have the default background color
• Known words will have a green background
• Words with modifiers will be bolded or underlined

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