Bump translationstring from 1.3 to 1.4

Bumps [translationstring](https://github.com/Pylons/translationstring) from 1.3 to 1.4.
- [Release notes](https://github.com/Pylons/translationstring/releases)
- [Changelog](https://github.com/Pylons/translationstring/blob/master/changes.rst)
- [Commits](Pylons/translationstring@1.3...1.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements.txt

@@ -29,7 +29,7 @@ requests==2.24.0
 simplejson==3.17.0
 six==1.15.0
 transaction==3.0.0
-translationstring==1.3
+translationstring==1.4
 ujson==3.0.0
 urllib3==1.25.9
 venusian==3.0.0