a few problems finding my way

Hello there! First of all: Great theme! But i still have some issues i cannot figure out myself:

1. I need to change the background color of the message box. can’t find it in the stylesheet.css…?

2. i need to center two columns in the about us section, and i would like to have the same size of profile images, no matter how many profile pics are shown in one row. it should be as followed: 2 pics on the top – centered. below 3 pics ,centered as well. how can i make that work? i can center text easily, but not the rest of the content.

3. i have no blog template in the Template section. It only shows standard template, contact page, full width, with sidebar and portfolio. is that correct? i created several posts, but how do have them showed on the blog page?

4. last but not least: where can i change the language for the contact form headlines? (contact form, subject, etc.) or do i have to replace the contact form and create my own?

Thank you for your reply and help!