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.

---------

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

app/welcome.ejs

@@ -5,13 +5,13 @@
     </div>-->
     <div id="welcomeContent">
         <img id="welcomeImageSeal" src="assets/images/SealCircle.png"/>
-        <span id="welcomeHeader">WELCOME TO WESTEROSCRAFT</span>
-        <span id="welcomeDescription">Our mission is to recreate the universe imagined by author George RR Martin in his fantasy series, A Song of Ice and Fire.  Through the collaborative effort of thousands of community members, we have sought to create Westeros as accurately and precisely as possible within Minecraft.  The world we are creating is yours to explore.  Journey from Dorne to Castle Black, and if you aren’t afraid, beyond the Wall itself, but best not delay.  As the words of House Stark ominously warn: Winter is Coming.</span>
+        <span id="welcomeHeader"><%- lang('welcome.welcomeHeader') %></span>
+        <span id="welcomeDescription"><%- lang('welcome.welcomeDescription') %></span>
         <br>
-        <span id="welcomeDescCTA">You are just a few clicks away from Westeros.</span>
+        <span id="welcomeDescCTA"><%- lang('welcome.welcomeDescCTA') %></span>
         <button id="welcomeButton">
             <div id="welcomeButtonContent">
-                CONTINUE
+                <%- lang('welcome.continueButton') %>
                 <svg id="welcomeSVG" viewBox="0 0 24.87 13.97">
                     <defs>
                         <style>.arrowLine{fill:none;stroke:#FFF;stroke-width:2px;transition: 0.25s ease;}</style>