1.Child Theme
This theme fully supports the Child Theme.
A WordPress child theme is a theme that inherits the functionality of the parent theme. With the child theme, you can make the modification or add additional functionality to the parent theme. A child theme is the safest and easiest way to modify an existing theme, whether you want to make a few tiny changes or extensive changes.
You may read how to create child theme here http://codex.wordpress.org/Child_Themes
2. Translation
Step 1: Go to Plugins / Add new search plugin loco translate and install the pluginhttp://prntscr.com/gv02z7
Step 2: Go to Loco translate > Home > InWave Jobs
Step 3: Create New language http://prntscr.com/jnew9c
Select Language you want http://prntscr.com/jnewhi
Choose Language you need translate http://prntscr.com/jnewrp
Search text you need translate http://prntscr.com/jnexmt
After translate http://prntscr.com/jneyi0
Note: You need to select location files to Others.
If you used location file author after update plugin all translate text will remove.