Localize HeliosLauncher UI using lang files (#301)

* First step to use Language .json file in ejs

* i18n for landing.ejs

* i18n for login.ejs

* i18n for loginOptions.ejs

* i18n for overlay.ejs

* i18n for settings.ejs

* i18n for waiting.ejs

* i18n for welcome.ejs

* langloader.js placeholder support

* i18n for landing.js

* i18n for login.js

* i18n for overlay.js

* i18n for settings.js

* i18n for uibinder.js

* i18n for uicore.js

* remove html language replacement

* use toml for i18n

* Fix mojang/microsoft status icon is undefined

* cascadable langloader

* separate lang file for customization

* move some placeholder text to _placeholder.toml

* Update

* Reduce package lock diff.

* Remove another placeholder.

* Checkbox does not require translation.

* Icons don't need translation.

* Leave placeholders inline.

* Fix translation for news pages.

* Remove more unneeded translations.

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Co-authored-by: Daniel Scalzi <d_scalzi@yahoo.com>

app/waiting.ejs

@@ -2,7 +2,7 @@
     <div id="waitingContent">
         <div class="waitingSpinner"></div>
         <div id="waitingTextContainer">
-            <h2>Waiting for Microsoft..</h2>
+            <h2><%- lang('waiting.waitingText') %></h2>
         </div>
     </div>
 </div>