Localize “email address” placeholder on home page (#19359)

i18n/en.toml

@@ -189,3 +189,6 @@ other = "Warning:"
 
 [whatsnext_heading]
 other = "What's next"
+
+[input_placeholder_email_address]
+other = "email address"

layouts/index.html

@@ -25,7 +25,7 @@
             <div id="mc_embed_signup_scroll">
         	<p style="font-size: 20px">{{ T "main_kubeweekly_baseline" }}</p>
           <br />
-        	<input type="email" value="" name="EMAIL" class="email" id="mce-EMAIL" placeholder="email address" aria-label="email" required>
+        	<input type="email" value="" name="EMAIL" class="email" id="mce-EMAIL" placeholder="{{ T "input_placeholder_email_address" }}" aria-label="email" required>
             <!-- real people should not fill this in and expect good things - do not remove this or risk form bot signups-->
             <div style="position: absolute; left: -5000px;" aria-hidden="true"><input type="text" name="b_3885586f8f1175194017967d6_11c1b8bcb2" tabindex="-1" value=""></div>
             <div class="clear"><input type="submit" value="Subscribe" name="subscribe" id="mc-embedded-subscribe" class="button"></div>