I’m going to assume you’re using one of the premium templates … see this FAQ. The full list if
str_ options can be found under the template’s Customization Option in the nav at the top of the page. Here’s the link to the cMap Customization Options. Each template has pretty much the same options available.
For string that are not part of the template you can use the Say What? plugin.
It’ll add a new Text Changes menu item. Click Add New, enter the string exactly as shown in Connections, enter connections [notice the lack of capitalization, that's important!] as the domain and then enter your new text.
The great thing about using this plugin is that it will be update safe and you can use it on any other plugin that has been properly internationalized.
Hope that helps.