Internationalize more strings (#2440)

Co-authored-by: Ansh <anshnanda10@gmail.com>

src/view/shell/desktop/LeftNav.tsx

@@ -255,7 +255,7 @@ function ComposeBtn() {
           />
         </View>
         <Text type="button" style={styles.newPostBtnLabel}>
-          <Trans>New Post</Trans>
+          <Trans context="action">New Post</Trans>
         </Text>
       </TouchableOpacity>
     </View>

src/view/shell/desktop/RightNav.tsx

@@ -56,7 +56,7 @@ export function DesktopRightNav({routeName}: {routeName: string}) {
           {isSandbox ? (
             <View style={[palError.view, styles.messageLine, s.p10]}>
               <Text type="md" style={[palError.text, s.bold]}>
-                SANDBOX. Posts and accounts are not permanent.
+                <Trans>SANDBOX. Posts and accounts are not permanent.</Trans>
               </Text>
             </View>
           ) : undefined}

src/view/shell/desktop/Search.tsx

@@ -176,7 +176,7 @@ export function DesktopSearch() {
                 onPress={onPressCancelSearch}
                 accessibilityRole="button"
                 accessibilityLabel={_(msg`Cancel search`)}
-                accessibilityHint="Exits inputting search query"
+                accessibilityHint={_(msg`Exits inputting search query`)}
                 onAccessibilityEscape={onPressCancelSearch}>
                 <Text type="lg" style={[pal.link]}>
                   <Trans>Cancel</Trans>