Spouse Visa Application

I’m in the process of filling in the application for a CoE for the spouse of Japanese national visa. I’ll be travelling to Japan soon anf while I’m over there my husband and I can collect everything together and submit, hopefully.

These will seem like very nitpicky questions but we really want to get it right and not have any issues with the application.

1. When filling in my most recent trips to Japan do I include the trip I will only be partway through when submitting the application, or should I only fill in completed stays? I have a flexible ticket and my return date could change due to family circumstances, so I’d hate to give the wrong information. Also, in the same section should I just say that the purpose of my visits was 「観光」even if it was to spend time with my boyfriend (of course with sightseeing as an extra though).
2. I want to submit the forms all in Japanese, and my husband or myself will most likely handwrite the section detailing our relationship to date. In order to show that I have Japanese proficiency would it help if I described things from my account? As in “I like to help [husband] with his English conversation practice so we can take more trips to my home country together in future” (it seems to odd to write it objectively if that makes sense)
3. Actually, I’m getting quite stuck on the previously mentioned question. I know it’s highly personal but are there any points apart from how we met, things we’ve done together, plans for the future that would be helpful to include?
4. My dad passed away a few years ago before I met my husband. On the form I will mark him down as deceased but do I need to include his age, too? I guess it would have to be the age he died.
5. I have a university degree. Should I include a copy of this or the transcript.
6. Do all of the documents submitted in English (copies of my savings account statements, aformentioned certificates, etc) need to be translated to Japanese?