contrib: fix for macOS deployment build failing on Qt translations even though it is optional. #33482

1. 
   amishhaa commented at 5:35 am on September 26, 2025: none

   From what I deciphered reading the line https://github.com/bitcoin/bitcoin/blob/master/contrib/macdeploy/macdeployqtplus#L390 is that qt translations are optional to have hence we should be able to build without it but the case where the flag translations_dir falls back to its default Null value it raises this error. I have moved the code which adds language files under the if statement that first checks if the value of the flag is not Null before referencing it. This PR assumes that having Qt translations is optional however this statement requires a second opinion. Build completes successfully post this change with default value of the flag.

2. contrib: fix using macdploy script without translations.

   QT translations are optional, but the script would error when
   'translations_dir' falls back to its default value NULL.
   
   This PR fixes it by moving the set-up of QT translations under
   the check for 'translations_dir' presence.

   7b5261f7ef
3. DrahtBot added the label Scripts and tools on Sep 26, 2025
4. 
   DrahtBot commented at 5:35 am on September 26, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

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   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/33482.

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5. 
   amishhaa commented at 5:36 am on September 26, 2025: none

   Refer PR: #33358 for previous discussions.

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