Lexicon list

[dwhieb]

Related Issue:

closes #469

Description of Changes

This PR integrates the Lexemes List into the Lexicon page. The list just displays the lexemes for the language; it doesn't allow for adding/deleting/displaying lexemes yet.

Lots of other miscellaneous changes in this one too:

• Made private variables/methods in App.js public. (They were unnecessary and getting obnoxious.)
• Separated page rendering into renderPage and displayPage methods, which simplifies the rendering logic. renderPage is only called when the <main> element for a page isn't already present.
• Added App#changeLanguage, which deletes the <main> element for the Languages page so it will rerender.
• Adjusted the Language Chooser to function in a way parallel to other pages.
• Minor tweak to padding on Help Menu.
• Adjusted the naming/ID conventions for <main> elements to take into account that now there can be more than 1 <main> element.
• Moved the E2E tests for Additional Names and Orthographies into Languages.e2e.js.

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