Mobile Zen

Bigger screen
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Doesn't matter screen, buttons will always be in view
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Barebones monotranslation
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The new functionality is having multiple languages that are all editable, with 4 possible options to do so.

Translations: (green) Anything translated.
Assumptions: (red) ~ the current "mark as needs work", but also easy to do for source.
Suggestions: (yellow) Same as now.
Comments: (gray) Write them in the field that is being commented on. This saves a lot of space wrt. now.

the idea is that one colour or another relates to

Revert button: Resets string if anything is entered. If in original state, it reverts to previous translation in history. A → will appear to go forwards again when that happens.
Collapsible details for each language.

Edit: From a design perspective, red green isn't so great for colour-blind people, but this is the most obvious scale I could think of. Dithering into green.

Edit2: Ideas, move revert button, also, could show small colour balls to indicate there are for example comments, when collapsed.