diff --git a/CHANGELOG.md b/CHANGELOG.md
index 76ea541..a001220 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,8 @@ See [keep a changelog](https://keepachangelog.com/en/1.0.0/) for information abo
 
 ## [Unreleased]
 
+- [PR-34](https://github.com/itk-dev/aapodwalk_api/pull/34)
+  UI improvements
 - [PR-33](https://github.com/itk-dev/aapodwalk_api/pull/33)
   Security update
 - [PR-32](https://github.com/itk-dev/aapodwalk_api/pull/32)
diff --git a/assets/admin.js b/assets/admin.js
index 31522a7..4471a8f 100644
--- a/assets/admin.js
+++ b/assets/admin.js
@@ -81,4 +81,19 @@ window.addEventListener("load", () => {
 			}
 		}
 	});
+
+	// Open accordions with errors on submit.
+	document.addEventListener("ea.form.error", (event) => {
+		const { page, form } = event.detail;
+		const elements = form.querySelectorAll(".accordion-item .has-error");
+		for (const el of elements) {
+			const item = el.closest(".accordion-item");
+			const button = item?.querySelector(".accordion-header button");
+			const contents = item?.querySelector(".accordion-collapse");
+			if (button && contents) {
+				button.classList.remove("collapsed");
+				contents.classList.add("show");
+			}
+		}
+	});
 });
diff --git a/src/Form/LocationType.php b/src/Form/LocationType.php
index 0386838..173d655 100644
--- a/src/Form/LocationType.php
+++ b/src/Form/LocationType.php
@@ -27,7 +27,8 @@ public function buildForm(FormBuilderInterface $builder, array $options): void
 
     public function implodeCoordinates(?array $coordinates): string
     {
-        return implode(', ', $coordinates ?? []);
+        // Separate non-empty values with comma.
+        return implode(', ', array_filter($coordinates ?? []));
     }
 
     public function explodeCoordinates(string $coordinates): array
diff --git a/translations/admin+intl-icu.da.xlf b/translations/admin+intl-icu.da.xlf
index 5fc2dff..8fb52ab 100644
--- a/translations/admin+intl-icu.da.xlf
+++ b/translations/admin+intl-icu.da.xlf
@@ -115,7 +115,7 @@
       </trans-unit>
       <trans-unit id="Q4p_Gmi" resname="API documentation">
         <source>API documentation</source>
-        <target state="translated">API-documentation</target>
+        <target state="translated">API-dokumentation</target>
       </trans-unit>
       <trans-unit id="mpHDX6N" resname="Administration">
         <source>Administration</source>
@@ -211,7 +211,7 @@
       </trans-unit>
       <trans-unit id="XkthfIE" resname="Enter a location on the form &lt;code&gt;lat, lng&lt;/code&gt;, e.g. &lt;code&gt;56.153244272970866, 10.213798100000005&lt;/code&gt;. &lt;strong&gt;Notice&lt;/strong&gt;: the two numbers must always be separated by a comma and use dot as decimal separator.&lt;br&gt;Hint: Open &lt;a href=&quot;https://www.google.com/maps&quot; target=&quot;_blank&quot;&gt;Google Maps&lt;/a&gt; and “right” click on the map to get the coordinates.">
         <source>Enter a location on the form &lt;code&gt;lat, lng&lt;/code&gt;, e.g. &lt;code&gt;56.153244272970866, 10.213798100000005&lt;/code&gt;. &lt;strong&gt;Notice&lt;/strong&gt;: the two numbers must always be separated by a comma and use dot as decimal separator.&lt;br&gt;Hint: Open &lt;a href="https://www.google.com/maps" target="_blank"&gt;Google Maps&lt;/a&gt; and “right” click on the map to get the coordinates.</source>
-        <target state="translated"><![CDATA[Indtast en lokation på formen <code>breddegrad, længdegrad</code>, fx. <code>56.153244272970866, 10.213798100000005</code>. <strong>Bemærk</strong>: de to tal skal altid adskilles af et komma og skal bruge punktum som decimalseparator.<br>Tip: Åbn <a href="https://www.google.com/maps" target="_blank">Google Maps</a> and højreklik på kortet for at få koordinaterne.]]></target>
+        <target state="translated"><![CDATA[Indtast en lokation på formen <code>breddegrad, længdegrad</code>, fx. <code>56.153244272970866, 10.213798100000005</code>. <strong>Bemærk</strong>: de to tal skal altid adskilles af et komma og skal bruge punktum som decimalseparator.<br>Tip: Åbn <a href="https://www.google.com/maps" target="_blank">Google Maps</a> og højreklik på kortet for at få koordinaterne.]]></target>
       </trans-unit>
       <trans-unit id="p.sAfxC" resname="The total duration of the route, i.e. the total duration of audio tracks in the route plus the time needed for moving along the route.">
         <source>The total duration of the route, i.e. the total duration of audio tracks in the route plus the time needed for moving along the route.</source>
@@ -303,7 +303,7 @@
       </trans-unit>
       <trans-unit id="_z4el3Z" resname="The password fields must match.">
         <source>The password fields must match.</source>
-        <target state="translated">Adgangskoderne er ikke ens</target>
+        <target state="translated">Adgangskoderne er ikke ens.</target>
       </trans-unit>
       <trans-unit id="Zm.jZiK" resname="New password">
         <source>New password</source>