Update lang_en.php

landing page text updated
Update lang_en.php
Update lang_en.php

updated text enviroCar & citizen Science and The enviroCar platform
This fixes issue #184
This fixes issue #186
added an extra block on about page, fixes #185
Merge pull request #189 from nuest/dev

added an extra block on about page, fixes #185
Update lang_en.php

Updated About blocks. Added text to app block
Update lang_en.php
Merge pull request #191 from enviroCar/dev

Content update