Length assistance

### Describe the problem

Using the editor for translating to RTL languages may be inconvenient when trying to keep a certain length for lines.

Since English is LTR and the translation box is RTL I can't determine the right length of the text.

### Describe the solution you'd like

Some sort of cue to show the right measurements for the original text in the RTL textbox.

### Describe alternatives you've considered

There are several alternatives:
1. Copyin the line to the translation box and remove it when unneeded.
2. Disable RTL mode momnentarily and then switch it back when needed.

### Screenshots

This is what happens when the text is aligned right:

This is what I can see when I switch to LTR:

### Additional context

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