Small screen usability improvements / source and target language

[eb1]

Describe the bug Some issues uncovered by Bruce while testing the create project wizard / source and target language pages on a smaller Android phone (5.x):

1. Very little of the search results dropdown appears when the software / on-screen keyboard displays.
2. Language codes appear at the beginning of the list items, rather than at the end.

3. In the case where there are numerous results (e.g. English and its variants):

   • The alphabetical sorting isn't helpful; the commonly used items (2 digit ISO639 codes) can be buried in the list.
   • Items appear off-screen, and there is no indication that the dropdown is sortable.

To address these issues, we should look at the following:

• [X] Hiding the step instructions when the language name field has focus, so that more results can display in the UI
• [X] Changing the result list items, so that the language code appears after the name
• [x] Look at moving the 2 digit ISO 639 code results to the top of the list, as they would be more commonly used
• [x] Provide an indicator that the search results are scrollable (listed as #398)

[eb1]

Forgot to add a screen shot showing the space (or lack thereof) available to the languages dropdown list.