While reviewing src/fpm_backend.F90, I noticed a few compilation-related error messages that could be simplified and made more consistent.

Examples include wording such as:

• stopping due to failed compilation
• Compilation failed for object "..."

These could be simplified to clearer wording such as:

• compilation failed
• compilation failed for object "..."

This change only improves the wording of the messages and does not modify program logic or behavior.

Proposed change

• Simplify wording of compilation error messages
• Standardize capitalization of error messages
• Keep the existing context (such as object names)

I have prepared a small patch implementing these wording improvements and will open a pull request referencing this issue.