Hi there! Welcome to the forum! First off, I think your English is great, so don't worry about that. There are actually quite a few people here who do not speak English as their first language and we all do fine.
Volume 38 of Get Backers is currently being translated (we haven't gotten to Volume 39 as yet), but the new chapters are only accessible to the people who have reached a quota of 15 posts. You only have 10 to go at this point, so keep on posting and sharing and participating in discussions and you'll be reading the latest chapters before you know it.
Again, welcome! Make yourself at home and have fun!