Translations/: add missing exec bit for python scripts

[ia]

• Please check if the PR fulfills these requirements

• The changes have been tested locally
• There are no breaking changes

• What kind of change does this PR introduce?
  Add exec bit for python scripts which don't have it.

• What is the current behavior?
  To run some python scripts by calling them using name only (i.e., ./script.py), a user must do chmod a+x script.py first as an extra step.

• What is the new behavior (if this is a feature change)?
  All py & sh scripts will be with executable bit by default.

• Other information:
  It's a common good practice to have such scripts in a repo with executable bit by default for convenience.