Start screen label updates

[wdprice]

Update text in labels as follows:

1. Choose a Role
2. Select from a list of pre-defined roles which Topcoder develops talent for. Standardized Job Descriptions and baseline skills are available for review.
3. Select one or more technical skills you need. Topcoder will match your requirements to our talent.
4. Input a Job Description and Topcoder will extract the required skills from it, then find the best matching talent for the job duties.

[sdgun]

Verified in Dev.

@nikolay83
The app has an additional 'which' in the point 3 text(Input skills description)

[nikolay83]

@sdgun "which" word is removed now

[sdgun]

Verified in Dev.

[sdgun]

Verified in production.