ISBNtoBibTeX error mesage is now more clear

[Siedlerchr]

This is my first Pull Request.

Refs #684.

[koppor]

Your commit 33bd952 changes each line in the file. Did you use Eclipse eGit? This causes issues at Windows because of the line endings or to change to LF at the git checkout. I would recommend to always use git gui instead of eGit.

Please read CONTRIBUTING.md which explains some details on the PRs. Especially that one should not use the master branch: All future updates to your master branch will be shown here in this PR. This is a known issue.

Finally, for small changes such as merging the master branch or the correct usage of the localization, please do

1. git fetch upstream --prune
2. git merge upstream/master
3. git reset upstream/master
4. git gui

In git gui, review and commit your changes. Then do a force push to overwrite your changes here. This squashes all commits into a single one. If you want to keep multiple commits, please continue reading at using-git-rebase.

The first two steps are basically https://help.github.com/articles/syncing-a-fork/, where step 4 is skipped.

Hint: At Windows: set the environment variable LANG to en.

You can also send me a private mail if you have any issues in using git.

[simonharrer]

And can you please merge your 4 commits into 1 commit as well as add a changelog entry describing your change?

What is more:

• Localization.lang does not use %s as placeholders but %0 and %1 etc.
• When updating Localization.lang keys, we have a test in place which ensures that the localizations are correct. You may need to look into this as well.

[Siedlerchr]

Thanks for all the tips. I will look at this today in the evening.

[simonharrer]

@Siedlerchr I think this would be helpful to be merged in for the next release. Could you perhaps complete the PR in the next days?

[Siedlerchr]

@simonharrer I've been busy, but I will try to finish the PR tomorrow.

[simonharrer]

Duplicate of #761