you need to translate every string from all plugins and theme. translated them one by one. On every update local files will be affected so that you need to put these translated files into global folders. it will prevent string loss from the update.
here is how you can achieve this.
Note: in this, I am using my local test setup site language which is "Português do Brasil". you have to select your site language.
Always sync and save the pot file
Note: Always copy local .Po | .Mo files into the global folder. it will prevent from translation string loss while updating theme/ plugins
- then goto wp-admin > loco translate > theme/plugin > theme name / plugin name.
- Copy author file to system file.
- the author stands for local file and the system stands for the global file.
- once your done copying. from now you have to translate a string in global (system) file.
These steps should be followed for all plugins and themes in which you are making any changes.