Is this the plugin that you’re talking about https://www.ads-software.com/plugins/reach-us-contact-form/? If yes, please remove the rscf- part from the beginning of all the PO and MO files and tell me how things work this time. Basically, this part needs to be added only when the PO/MO files are added to the wp-content/languages/plugins folder. However, since these files are inside the plugin folder, you don’t need this part.