misc: unify terminology

8+3 filename → 8.3 filename
be ware → beware
{cannot, can not, can't, could not, couldn't} → unable to
familly → family
file name → filename
informations → information
plateform → platform
trial → attempt
trying to → attempting to
{web-server, webserver} → Web server

Change-Id: I33b1a0091b5af4f0f055bd4c21b2a05a39adbc50
GitLab: https://git.jami.net/savoirfairelinux/jami-client-qt/issues/1730
diff --git a/tools/dvpn/main.cpp b/tools/dvpn/main.cpp
index 1cf3ec9..6753739 100644
--- a/tools/dvpn/main.cpp
+++ b/tools/dvpn/main.cpp
@@ -122,7 +122,7 @@
         printf("read configuration file: %s\n", params.configuration.c_str());
         std::ifstream config_file(params.configuration);
         if (!config_file.is_open()) {
-            std::cerr << "Error: Could not open configuration file.\n";
+            std::cerr << "Error: Unable to open configuration file.\n";
         } else {
             YAML::Node config = YAML::Load(config_file);
             if (config["bootstrap"] && params.bootstrap.empty()) {