tests/sitecustomize.py

i18n: use util.pconvert() instead of 'str.replace()' for problematic encoding

some problematic encodings use backslash as part of multi-byte characters.

util.pconvert() can treat strings in such encodings correctly, if
win32mbcs is enabled, but str.replace() can not.

try:
    import coverage
    getattr(coverage, 'process_startup', lambda: None)()
except ImportError:
    pass