Multilingual preflabels: Additional fixes to obscure unit test failures

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.08%. Comparing base (a65341b) to head (602471e). Report is 5 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #224 +/- ## ======================================== Coverage 81.08% 81.08% ======================================== Files 74 74 Lines 5250 5251 +1 ======================================== + Hits 4257 4258 +1 Misses 993 993 ``` | [Flag](https://app.codecov.io/gh/ncbo/ontologies_linked_data/pull/224/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ncbo) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/ncbo/ontologies_linked_data/pull/224/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ncbo) | `81.08% <100.00%> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ncbo#carryforward-flags-in-the-pull-request-comment) to find out more.

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