Improve capitalisation in string

Remove random mid-sentence capitalisation in Security Phrase dialog. The
dialog will change at some point but for now lets make it more human
readable.

Fixes #19429

src/components/views/dialogs/security/AccessSecretStorageDialog.tsx

@@ -334,7 +334,7 @@ export default class AccessSecretStorageDialog extends React.PureComponent<IProp
 
             content = <div>
                 <p>{ _t(
-                    "Enter your Security Phrase or <button>Use your Security Key</button> to continue.", {},
+                    "Enter your Security Phrase or <button>use your Security Key</button> to continue.", {},
                     {
                         button: s => <AccessibleButton className="mx_linkButton"
                             element="span"

src/i18n/strings/en_EN.json

@@ -2658,7 +2658,7 @@
     "If you reset everything, you will restart with no trusted sessions, no trusted users, and might not be able to see past messages.": "If you reset everything, you will restart with no trusted sessions, no trusted users, and might not be able to see past messages.",
     "Security Phrase": "Security Phrase",
     "Unable to access secret storage. Please verify that you entered the correct Security Phrase.": "Unable to access secret storage. Please verify that you entered the correct Security Phrase.",
-    "Enter your Security Phrase or <button>Use your Security Key</button> to continue.": "Enter your Security Phrase or <button>Use your Security Key</button> to continue.",
+    "Enter your Security Phrase or <button>use your Security Key</button> to continue.": "Enter your Security Phrase or <button>use your Security Key</button> to continue.",
     "Security Key": "Security Key",
     "Use your Security Key to continue.": "Use your Security Key to continue.",
     "Destroy cross-signing keys?": "Destroy cross-signing keys?",