Change wording for in skins

[Kristina Hoeppner]

1.8.0 RC1

We try to avoid using "Mahara" on the front end because people may have named their site differently. For the skins logo, this cannot be avoided entirely because two options are for the Mahara logo. However, since institutions / sites may be using their own logo, the word "Mahara" should not be used to denote the logo.

I propose to change the following strings:

Mahara logo image -> Logo
White logo and text -> White Mahara logo and text
Dark logo and text -> Dark Mahara logo and text

[Kristina Hoeppner (kris-hoeppner)]

https://reviews.mahara.org/2607

[Kristina Hoeppner (kris-hoeppner)]

I also propose to change

Background colour for even / odd lines -> Background colour for even / odd rows

as we normally speak of "rows" for tables and not "lines".