fix: make sure all l10n keys are defined in en.ts

[tukusejssirs]

Changes:

• fix(la): rename mary_of_jesus_in_the_blessed_sacrament_venegas_virgin to mary_of_jesus_in_the_blessed_sacrament_venegas_de_la_torre_virgin;
• test(l10n): add a unit test to check if all names l10n keys defined in non-English locales, are also defined in en.ts.

[tukusejssirs]

TODO before making taking this PR out of WIP status:

• fix Should we localise base celebration names when we use only one with a patronage title? #453;
• deal with dedication_of_consecrated_churches* keys (Add dedicationOfAParticularChurch to general.js #136, esp this comment);
• [optional] create a test to make sure all keys used by calendars are defined in en (cf How to get a list of all l10n keys used by a calendar? #454);
• @emagnier: review the changes;
• run pnpm run prettier:fix;
• run pnpm run test:snapshot:update.

After merging this PR, I want to port the changes to optimizations-ex in a separate PR.