GBL: v2.4.0 changes

Gems: bump to GBL 2.4.0 and lock execjs at 2.7.0 to avoid "TypeError: Cannot read property 'version' of undefined" error. See: rails/execjs#99

SVG: remove title element
Blacklight automatically populates the title popover value from the locales or the filename here.

JS: remove unused modules

Advanced Search: remove BL config try block. Not using in B1G and it tosses a SystemStackError

Locales: add v2.4.0 additions

Settings: add v2.4.0 additions

Gemfile

@@ -2,6 +2,7 @@ source 'https://rubygems.org'
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
 ruby '2.7.2'
+gem 'execjs', '2.7.0'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 5.2.5'
@@ -68,7 +69,7 @@ gem 'blacklight_advanced_search', git: 'https://github.com/projectblacklight/bla
 gem 'blacklight_range_limit', '~> 7.0.0'
 gem 'chosen-rails' #  jquery multiselect plugin for advanced search
 
-gem 'geoblacklight', '~> 2.3.0'
+gem 'geoblacklight', '~> 2.4.0'
 gem 'rsolr', '>= 1.0', '< 3'
 gem 'bootstrap', '~> 4.0'
 gem 'popper_js'