Fix exportTextFormat to keep dollar sign

[2wheeh]

Fixes #5319
Fixes #4931

Currently we uses String.replace() in exportTextFormat:

function exportTextFormat(...) {
// ...
  return textContent.replace(frozenString, output);
}

The issue happens when output has $&, $$, ....
It is because there are special replacement sequences beginning with $:

A workaround for this: https://stackoverflow.com/questions/9423722/string-replace-weird-behavior-when-using-dollar-sign-as-replacement

before:

before.mov

after:

after.mov

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[zurfyx]

LGTM, thank you for the fix!