Update copy on developer edition page (fix #13970) (#14021)

* Update copy on developer edition page (fix #13970)

* Add new fluent string ID based on feedback in PR #14021

* Improve readability of obsolete string

bedrock/firefox/templates/firefox/developer/includes/for-developers.html

@@ -13,7 +13,7 @@
 ) %}
   <h2 class="c-title">{{ ftl('firefox-developer-firefox-browser') }}</h2>
   <p class="c-subtitle">{{ ftl('firefox-developer-made-for-developers') }}</p>
-  <p>{{ ftl('firefox-developer-all-the-latest') }}</p>
+  <p>{{ ftl('firefox-developer-all-the-latest-v2', fallback='firefox-developer-all-the-latest') }}</p>
   <p>{{ ftl('firefox-developer-a-separate-profile') }}</p>
   <p>{{ ftl('firefox-developer-preferences-tailored') }}</p>
 {% endcall %}

l10n/en/firefox/developer.ftl

@@ -80,7 +80,11 @@ firefox-developer-congrats-you-now-have-firefox = Congrats. You now have { -bran
 firefox-developer-this-isnt-just-an-update = This isn’t just an update. This is { -brand-name-firefox-quantum }: A brand new { -brand-name-firefox } that has been rebuilt from the ground-up to be faster, sleeker, and more powerful than ever.
 firefox-developer-welcome-to-firefox-browser = Welcome to { -brand-name-firefox-browser } { -brand-name-developer-edition }
 firefox-developer-made-for-developers = The browser made for developers
+firefox-developer-all-the-latest-v2 = All the latest developer tools in beta, in addition to features like the Multi-line Console Editor and WebSocket Inspector.
+
+# Obsolete string
 firefox-developer-all-the-latest = All the latest developer tools in beta, plus <strong>experimental features</strong> like the Multi-line Console Editor and WebSocket Inspector.
+
 firefox-developer-a-separate-profile = A <strong>separate profile and path</strong> so you can easily run it alongside Release or { -brand-name-beta } { -brand-name-firefox }.
 firefox-developer-preferences-tailored = Preferences <strong>tailored for web developers</strong>: Browser and remote debugging are enabled by default, as are the dark theme and developer toolbar button.
 firefox-developer-congrats-you-now-have = Congrats. You now have { -brand-name-firefox-browser } { -brand-name-developer-edition }.