i18n: resolve duplicate message identifiers in code

src/features/ui/components/floating-action-button.tsx

@@ -10,7 +10,7 @@ import { Avatar, HStack, Icon } from 'soapbox/components/ui';
 import { useAppDispatch } from 'soapbox/hooks';
 
 const messages = defineMessages({
-  publish: { id: 'compose_form.publish', defaultMessage: 'Publish' },
+  publish: { id: 'compose_form.publish', defaultMessage: 'Post' },
 });
 
 /** FloatingActionButton (aka FAB), a composer button that floats in the corner on mobile. */

src/features/ui/components/modals/actions-modal.tsx

@@ -64,7 +64,7 @@ const ActionsModal: React.FC<IActionsModal> = ({ status, actions, onClick, onClo
 
             <li>
               <button type='button' onClick={onClose}>
-                <FormattedMessage id='lightbox.close' defaultMessage='Cancel' />
+                <FormattedMessage id='lightbox.close' defaultMessage='Close' />
               </button>
             </li>
           </ul>

src/features/ui/components/navbar.tsx

@@ -170,7 +170,7 @@ const Navbar = () => {
                     size='sm'
                     {...(features.nostrSignup ? { onClick: handleNostrLogin } : { to: '/login' })}
                   >
-                    <FormattedMessage id='account.login' defaultMessage='Log In' />
+                    <FormattedMessage id='account.login' defaultMessage='Log in' />
                   </Button>
 
                   {(isOpen) && (

src/features/ui/components/panels/sign-up-panel.tsx

@@ -19,7 +19,7 @@ const SignUpPanel = () => {
         </Text>
 
         <Text theme='muted' size='sm'>
-          <FormattedMessage id='signup_panel.subtitle' defaultMessage='Sign up now to discuss.' />
+          <FormattedMessage id='signup_panel.subtitle' defaultMessage="Sign up now to discuss what's happening." />
         </Text>
       </Stack>