fix(locale): suppress stack trace for malformed locale files, improve error message

[tastybento]

Summary

• YamlConfiguration.loadConfiguration(File) is Bukkit's static helper — it internally catches InvalidConfigurationException and logs it at SEVERE with a full stack trace via Bukkit.getLogger(), completely bypassing BentoBox's own try-catch
• Switch to new YamlConfiguration(); yaml.load(file) so BentoBox owns the exception and can log a clean, actionable message instead
• Split catch into InvalidConfigurationException (bad YAML) and generic Exception, both now log two clean lines: what went wrong and a note that English will be used as a fallback
• The locale folder name is included in the message so admins know which addon's file is the culprit

Before:

[ERROR]: Cannot load plugins\BentoBox\locales\Chat\cs.yml
org.bukkit.configuration.InvalidConfigurationException: mapping values are not allowed here
   at org.bukkit.configuration.file.YamlConfiguration.loadFromString(YamlConfiguration.java:112)
   ... 27 more lines of stack trace ...

After:

[BentoBox] Could not load locale file 'Chat/cs.yml': mapping values are not allowed here in 'reader', line 28, column 71: ...
[BentoBox] The file contains invalid YAML. Delete it and restart to regenerate, or fix the syntax. English will be used as a fallback.

Related: BentoBoxWorld/Chat#58 (fixes the specific malformed file that triggered this)
Fixes #2953

Test plan

• Place a malformed locale YAML file in a locale folder and start the server — verify only clean BentoBox log lines appear, no stack trace
• Players using the affected locale fall back to English correctly
• Valid locale files still load normally

🤖 Generated with Claude Code

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
28.6% Coverage on New Code
0.0% Duplication on New Code

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