* Add --lang= parameter and simple file listing to sync XML tools
Allow all qaxml-*.php scripts to accept --lang=XX to specify the
target language directly, without requiring temp/lang from
configure.php. Also accept file paths as positional arguments
for checking specific files instead of the full translation tree.
Existing behavior without parameters is preserved. Relates to #199.
* Rename $files to $filterFiles and warn on missing source files
Address review feedback: rename parameter for clarity and add
STDERR warning when a command-line file is not found in sourceDir.
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