Fix database not available (Zeitwerk and Docker error)

[armandfardeau]

This modules use a database for initialization but in some cases (Zeitwerk checks or precompilation of assets on Docker) a database is not available.

This P.R. allows usage in theses cases.

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (abbf0c6) 96.79% compared to head (5c2b648) 96.79%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #103 +/- ## ======================================== Coverage 96.79% 96.79% ======================================== Files 58 58 Lines 1153 1153 ======================================== Hits 1116 1116 Misses 37 37 ``` | [Files Changed](https://app.codecov.io/gh/mainio/decidim-module-term_customizer/pull/103?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=mainio) | Coverage Δ | | |---|---|---| | [lib/decidim/term\_customizer/i18n\_backend.rb](https://app.codecov.io/gh/mainio/decidim-module-term_customizer/pull/103?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=mainio#diff-bGliL2RlY2lkaW0vdGVybV9jdXN0b21pemVyL2kxOG5fYmFja2VuZC5yYg==) | `100.00% <ø> (ø)` | |

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[Quentinchampenois]

Hello @sinaeftekhar, Thank you for the review, I think I will continue this PR

If the change request only concerns typos in tests I can open a new PR to fix typos because I don't have write rights on the @armandfardeau's fork

[Quentinchampenois]

Hello, this PR won't be continued here but I can apply change request on a new one if needed

FYI, we already use this fix on our fork for containerized apps