[Translation] [Config] Clear libxml errors after parsing XML file
bug #11908 [Translation] [Config] Clear libxml errors after parsing xliff file (pulzarraider)

This PR was merged into the 2.3 branch.

Discussion
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[Translation] [Config] Clear libxml errors after parsing xliff file

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

If libxml_use_internal_errors is set to `true` before parsing xliff file, the libxml errors are not cleared correctly. An error `Validation failed: no DTD found !` occurs in libxml errors after parsing and it's available outside the xliff parser (can break other functionality that use `libxml_get_errors` function).

Commits
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fab61ef [Translation] [Config] Clear libxml errors after parsing XML file