Yes, in practice. Filings themselves are submitted in Hebrew and official correspondence from the authorities arrives in Hebrew, but that is your accountant's side of the work. The advisory relationship, your reporting, and correspondence handled on your behalf can all be conducted in English.
Official correspondence is issued in Hebrew. Where we act on your behalf, we handle it and explain the substance to you in English.
Internal records in English are generally workable. What ultimately matters is that the underlying documentation supports the figures reported.
Yes. Most of the ongoing relationship is handled remotely, throughout Israel.