Merge pull request #4324 from nextcloud/translate

Extract strings to be translatable

src/main/res/values/strings.xml

@@ -892,4 +892,6 @@
     <string name="error_report_issue_action">Report</string>
     <string name="error_crash_title">%1$s crashed</string>
     <string name="copied_to_clipboard">Copied to clipboard</string>
+    <string name="download_latest_dev_version">Download latest dev version</string>
+    <string name="changelog_dev_version">Changelog dev version</string>
 </resources>

src/main/res/xml/preferences.xml

@@ -90,11 +90,11 @@
 
 	<PreferenceCategory android:title="@string/prefs_category_dev" android:key="dev_category">
 		<Preference android:id="@+id/dev_link"
-					android:title="Download latest dev version"
+            android:title="@string/download_latest_dev_version"
 					android:key="dev_link" />
 
 		<Preference android:id="@+id/changelog_link"
-					android:title="Changelog dev version"
+            android:title="@string/changelog_dev_version"
 					android:key="changelog_link" />
 
         <Preference android:id="@+id/etm"