front-end: build using latest dev tools from npm

less 3.0.0 is more strict about empty variables, and @icon-font-path thus has
to be set to an empty string.

kallithea/front-end/kallithea-variables.less

@@ -41,7 +41,7 b''
 @panel-primary-border:              @panel-primary-heading-bg;
 @headings-font-weight:              700;
 @table-cell-padding:                2px 4px;
-@icon-font-path:                    ; /* no glyphicons */
+@icon-font-path:                    ""; /* no glyphicons */
 @icon-font-name:                    none;
 
 /* custom variables */

kallithea/front-end/package-lock.json

@@ -10,14 +10,16 b''
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-      "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
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+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
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       "dev": true,
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-        "json-stable-stringify": "^1.0.1"
+        "fast-deep-equal": "^2.0.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
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@@ -58,9 +60,9 b''
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@@ -77,9 +79,9 b''
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-      "integrity": "sha1-FDQt0428yU0OW4fXY81jYSwOeU8=",
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
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@@ -106,16 +108,6 b''
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     "bootstrap": {
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@@ -170,12 +162,11 b''
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-      "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
-      "dev": true,
-      "optional": true
+    "clone": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/clone/-/clone-2.1.2.tgz",
+      "integrity": "sha1-G39Ln1kfHo+DZwQBYANFoCiHQ18=",
+      "dev": true
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       "version": "4.7.0",
@@ -229,16 +220,6 b''
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@@ -247,15 +228,6 b''
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-        }
       }
     },
     "datatables.net": {
@@ -348,6 +320,20 b''
       "dev": true,
       "optional": true
     },
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+      "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz",
+      "integrity": "sha1-ewUhjd+WZ79/Nwv3/bLLFf3Qqkk=",
+      "dev": true,
+      "optional": true
+    },
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@@ -356,14 +342,14 b''
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-      "integrity": "sha1-M8GDrPGTJ27KqYFDpp6Uv+4XUNE=",
+      "version": "2.3.3",
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       "dev": true,
       "optional": true,
       "requires": {
         "asynckit": "^0.4.0",
-        "combined-stream": "^1.0.5",
+        "combined-stream": "^1.0.6",
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@@ -381,15 +367,6 b''
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@@ -419,21 +396,21 b''
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-      "integrity": "sha1-0mMTX0MwfALGAq/I/pWXDAFRNp4=",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/har-schema/-/har-schema-2.0.0.tgz",
+      "integrity": "sha1-qUwiJOvKwEeCoNkDVSHyRzW37JI=",
       "dev": true,
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-      "integrity": "sha1-M0gdDxu/9gDdID11gSpqX7oALio=",
+      "version": "5.1.3",
+      "resolved": "https://registry.npmjs.org/har-validator/-/har-validator-5.1.3.tgz",
+      "integrity": "sha512-sNvOCzEQNr/qrvJgc3UG/kD4QtlHycrzwS+6mfTrrSq97BvaYcPZZI1ZSqGSPR73Cxn4LKTD4PttRwfU7jWq5g==",
       "dev": true,
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-        "ajv": "^4.9.1",
-        "har-schema": "^1.0.5"
+        "ajv": "^6.5.5",
+        "har-schema": "^2.0.0"
       }
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@@ -442,26 +419,6 b''
       "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
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@@ -469,13 +426,13 b''
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@@ -552,15 +509,12 b''
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+      "optional": true
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@@ -569,13 +523,6 b''
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@@ -587,31 +534,23 b''
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@@ -624,9 +563,9 b''
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@@ -718,9 +657,9 b''
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@@ -768,9 +707,9 b''
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@@ -791,17 +730,24 b''
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@@ -846,34 +792,32 b''
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@@ -927,20 +871,10 b''
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@@ -1020,24 +954,8 b''
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@@ -1048,13 +966,23 b''
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+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.4.3.tgz",
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       "dev": true,
       "optional": true,
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+        "psl": "^1.1.24",
         "punycode": "^1.4.1"
+      },
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+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
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+          "dev": true,
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     "treeify": {
@@ -1080,6 +1008,16 b''
       "dev": true,
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+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
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@@ -1113,15 +1051,6 b''
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kallithea/front-end/package.json

@@ -14,8 +14,8 b''
     "select2-bootstrap-css": "1.2.4"
   },
   "devDependencies": {
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-    "less-plugin-clean-css": "~1.5",
-    "license-checker": "24.1.0"
+    "less": "3.10.3",
+    "less-plugin-clean-css": "1.5.1",
+    "license-checker": "25.0.1"
   }
 }